Stock-Based Compensation (Details Narrative) - USD ($)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
Oct. 29, 2018 |
Oct. 26, 2018 |
Oct. 23, 2018 |
Aug. 22, 2018 |
Apr. 30, 2019 |
Dec. 31, 2018 |
Oct. 31, 2018 |
Apr. 30, 2019 |
Apr. 30, 2018 |
Apr. 30, 2019 |
Apr. 30, 2018 |
Purchase price of incentive stock options as a percentage of its fair value |
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85.00%
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Number of stock options cancelled |
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206,113
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Options granted to purchase shares |
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273,850
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Term of stock options |
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1 year 4 months 24 days
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Exercise price |
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$ 8.40
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Intrinsic value of options outstanding |
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$ 0
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$ 0
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$ 0
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Intrinsic value of options exercisable |
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0
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0
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0
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Unrecognized stock-based compensation expenses |
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$ 2,500,000
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$ 2,500,000
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$ 2,500,000
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Weighted-average grant date fair value of stock options granted |
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$ 4.00
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$ 11.00
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$ 5.70
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$ 12.40
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Number of shares issued for service, value |
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$ 211,896
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$ 600,400
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$ 657,504
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$ 1,443,650
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Shares available for grant |
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99,464
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99,464
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99,464
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Research And Development Expense [Member] |
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Stock-based compensation costs |
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$ 200,000
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400,000
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$ 1,100,000
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700,000
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General And Administrative Expense [Member] |
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Stock-based compensation costs |
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400,000
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1,500,000
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1,500,000
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3,800,000
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Restricted Stock Units (RSUs) [Member] |
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Stock-based compensation costs |
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$ 100,000
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$ 1,100,000
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$ 500,000
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$ 1,400,000
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Options granted to purchase shares |
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5,000
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Exercise price |
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$ 16.40
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Number of granted shares vested |
1,250
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2,500
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3,750
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Number of shares vesting, description |
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The Company's Board of Directors approved the accelerated vesting of 25% of the outstanding restricted stock units (RSUs) held by the employee. The RSUs, which originally vest on the third anniversary of the grant date, or March 29, 2020, were accelerated to vest on October 26, 2018.
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Number of shares vesting percentage |
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25.00%
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Modification of accrued expense on unvested stock units |
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$ 63,278
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Fair value of vested stock grants |
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$ 44,250
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Number of restricted stock outstanding |
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88,114
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88,114
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88,114
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Restricted Stock Units (RSUs) [Member] | October 29, 2019 [Member] |
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Number of granted shares vested |
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1,250
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Restricted Stock Units (RSUs) [Member] | October 29, 2020 [Member] |
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Number of granted shares vested |
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1,250
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Restricted Stock Units (RSUs) [Member] | October 29, 2021 [Member] |
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Number of granted shares vested |
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1,250
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Maximum [Member] |
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Maturity |
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6 years 6 months
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6 years 6 months
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Minimum [Member] |
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Maturity |
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5 years
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5 years
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Common Stock [Member] |
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Number of shares issued for service |
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15,300
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32,358
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48,000
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79,859
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Number of shares issued for service, value |
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$ 2
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$ 3
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$ 5
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$ 8
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Stock issued during period, shares, employee stock purchase plans |
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1,896
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2,635
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4,060
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Individual [Member] | Stock Option Cancellation Agreements [Member] |
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Number of stock options cancelled |
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30,000
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Number of restricted stock issued |
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17,500
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Stock-based compensation costs |
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$ 135,425
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Two Consultants [Member] | Stock Option Cancellation Agreements [Member] |
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Number of stock options cancelled |
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53,500
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Stock-based compensation costs |
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$ 377,278
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Employees [Member] |
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Options granted to purchase shares |
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20,000
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Term of stock options |
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10 years
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Vesting period of stock options granted |
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3 years
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Exercise price |
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$ 16.40
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Consultants [Member] |
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Stock-based compensation costs |
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$ 211,893
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$ 600,400
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$ 657,504
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$ 1,443,650
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Options granted to purchase shares |
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50,000
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Term of stock options |
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10 years
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Number of shares issued for service |
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15,300
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32,357
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48,000
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79,859
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Number of shares issued for service, value |
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$ 212,910
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$ 600,400
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$ 669,240
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$ 1,443,650
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Consultants [Member] | Maximum [Member] |
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Exercise price |
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$ 14.30
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Consultants [Member] | Minimum [Member] |
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Exercise price |
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$ 8.461
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Mr. Daniel J. O'Connor [Member] | Restricted Stock Units (RSUs) [Member] |
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Options granted to purchase shares |
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75,000
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Exercise price |
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$ 6.00
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Number of granted shares vested |
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6,250
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Number of shares vesting, description |
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The units vest as follows: 6,250 units vested on April 30, 2019, and the remaining 68,750 units vest in equal quarterly installments of 6,250 units beginning on April 30, 2019 and ending on October 31, 2021.
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Number of unit remaining available to vest |
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68,750
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Mr. Daniel J. O'Connor [Member] | Equal Quarterly Installments [Member] | Restricted Stock Units (RSUs) [Member] |
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Number of unit remaining available to vest |
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6,250
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Employees, Directors and Consultants [Member] |
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Stock-based compensation costs |
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600,000
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$ 1,900,000
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$ 2,600,000
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$ 4,500,000
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Board of Directors [Member] | Restricted Stock Units (RSUs) [Member] |
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Stock-based compensation costs |
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$ 1,100,000
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2011 Plan [Member] |
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Number of shares authorized for issuance to awards granted |
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100,000
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100,000
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100,000
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Provisional percentage of outstanding stock owned by stockholders |
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10.00%
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Number of stock options cancelled |
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206,115
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Options granted to purchase shares |
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273,850
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Exercise price |
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$ 8.40
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2011 Plan [Member] | Minimum [Member] |
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Purchase price of incentive stock options as a percentage of its fair value |
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100.00%
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Exercise price as a percentage of fair value of common stock |
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110.00%
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2011 Plan [Member] | Common Stock [Member] |
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Number of shares authorized for issuance to awards granted |
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950,000
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950,000
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950,000
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2011 Plan [Member] | Common Stock [Member] | Maximum [Member] |
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Maximum shares granted per fiscal year per individual |
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50,000
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Stock option exercisable period |
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10 years
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2011 Plan [Member] | Employees, Directors and Consultants [Member] |
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Employee stock purchase program description |
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The 2011 Plan authorizes a total of 750,000 for issuance thereunder, and includes an automatic increase of the number of shares of common stock reserved thereunder on the first business day of each calendar year by the lesser of: (i) 3% of the shares of the Company's common stock outstanding as of the last day of the immediately preceding calendar year; (ii) 100,000 shares; or (iii) such lesser number of shares as determined by the Company's Board of Directors.
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Number of shares authorized for issuance to awards granted |
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750,000
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750,000
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750,000
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Percentage of shares of common stock outstanding |
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3.00%
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3.00%
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3.00%
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2011 Plan [Member] | Employees [Member] |
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Options granted to purchase shares |
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125,350
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125,900
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Term of stock options |
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10 years
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10 years
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Vesting period of stock options granted |
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3 years
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3 years
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2011 Plan [Member] | Employees [Member] | Maximum [Member] |
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Exercise price |
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$ 15.80
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$ 18.60
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2011 Plan [Member] | Employees [Member] | Minimum [Member] |
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Exercise price |
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$ 6.001
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$ 9.20
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2011 Plan [Member] | Directors [Member] |
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Options granted to purchase shares |
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77,500
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115,000
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Term of stock options |
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10 years
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10 years
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Vesting period of stock options granted |
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1 year
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2011 Plan [Member] | Directors [Member] | Maximum [Member] |
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Vesting period of stock options granted |
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3 years
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Exercise price |
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$ 8.412
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$ 19.40
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2011 Plan [Member] | Directors [Member] | Minimum [Member] |
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Vesting period of stock options granted |
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1 year
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Exercise price |
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$ 5.80
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$ 9.79
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2011 Plan [Member] | Consultants [Member] |
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Options granted to purchase shares |
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1,000
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70,500
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Term of stock options |
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10 years
|
10 years
|
Exercise price |
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$ 6.254
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2011 Plan [Member] | Consultants [Member] | Maximum [Member] |
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Exercise price |
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$ 18.80
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2011 Plan [Member] | Consultants [Member] | Minimum [Member] |
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Exercise price |
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$ 10.00
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2011 Plan [Member] | Mr. Daniel J. O'Connor [Member] |
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Options granted to purchase shares |
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250,000
|
Vesting period of stock options granted |
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2 years
|
Number of granted shares vested |
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100,000
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2011 Plan [Member] | Mr. Daniel J. O'Connor [Member] | Performance Stock Option Award [Member] |
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Options granted to purchase shares |
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25,000
|
2011 Plan [Member] | Mr. Daniel J. O'Connor [Member] | Tranche One [Member] |
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Options granted to purchase shares |
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100,000
|
2011 Plan [Member] | Mr. Daniel J. O'Connor [Member] | Tranche Two [Member] | Performance Stock Option Award [Member] |
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Options granted to purchase shares |
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50,000
|
2011 Plan [Member] | Mr. Daniel J. O'Connor [Member] | Tranche Three [Member] |
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Options granted to purchase shares |
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25,000
|
ESPP [Member] |
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Stock-based compensation costs |
|
|
|
|
|
|
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|
|
$ 13,200
|
$ 16,300
|
Shares available for grant |
|
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|
39,661
|
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|
39,661
|
|
39,661
|
|
Discount from market price, offering date |
|
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|
15.00%
|
|
Fair market value of unvested shares, percentage |
|
|
|
|
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|
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|
15.00%
|
|
Maturity |
|
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|
6 months
|
6 months
|
Risk free interest rate |
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2.22%
|
1.15%
|
Volatility rate |
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61.83%
|
62.60%
|
Forfeitures percentage |
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0.00%
|
0.00%
|
Dividend |
|
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|
$ 0
|
$ 0
|
ESPP [Member] | Six Month Call On The Unvested Share [Member] |
|
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|
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|
Purchase price of incentive stock options as a percentage of its fair value |
|
|
|
|
|
|
|
|
|
85.00%
|
|
ESPP [Member] | January 31, 2019 [Member] | Sixth Offering Period [Member] |
|
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|
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|
Shares purchased |
|
|
|
|
|
|
|
|
|
1,428
|
|
ESPP [Member] | July 31, 2016 [Member] | First Offering Period [Member] |
|
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Shares purchased |
|
|
|
|
|
|
|
|
|
1,778
|
|
ESPP [Member] | January 31, 2017 [Member] | Second Offering Period [Member] |
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|
Shares purchased |
|
|
|
|
|
|
|
|
|
1,863
|
|
ESPP [Member] | July 31, 2017 [Member] | Third Offering Period [Member] |
|
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|
Shares purchased |
|
|
|
|
|
|
|
|
|
2,164
|
|
ESPP [Member] | January 31, 2018 [Member] | Fourth Offering Period [Member] |
|
|
|
|
|
|
|
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|
Shares purchased |
|
|
|
|
|
|
|
|
|
1,896
|
|
ESPP [Member] | July 31, 2018 [Member] | Fifth Offering Period [Member] |
|
|
|
|
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|
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|
Shares purchased |
|
|
|
|
|
|
|
|
|
1,207
|
|