Stock-Based Compensation (Details Narrative) - USD ($)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
Oct. 31, 2018 |
Oct. 29, 2018 |
Oct. 26, 2018 |
Oct. 23, 2018 |
Aug. 22, 2018 |
Oct. 31, 2018 |
Oct. 31, 2018 |
Oct. 31, 2017 |
Jan. 31, 2018 |
Number of shares authorized for issuance to awards granted |
2,200,176
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2,200,176
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2,200,176
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Purchase price of incentive stock options as a percentage of its fair value |
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85.00%
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Number of stock options cancelled |
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1,538,541
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Options granted to purchase shares |
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568,500
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Term of stock options |
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1 year 5 months 12 days
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Exercise price |
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$ 1.53
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Intrinsic value of options outstanding |
$ 2,400,000
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$ 2,400,000
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$ 2,400,000
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Intrinsic value of options exercisable |
1,600,000
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1,600,000
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1,600,000
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Unrecognized stock-based compensation expenses |
$ 2,800,000
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$ 2,800,000
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$ 2,800,000
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Weighted-average grant date fair value |
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$ 0.99
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$ 0.67
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Number of shares issued for service |
82,000
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Restricted Stock Units (RSUs) [Member] |
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Stock-based compensation expense recognized |
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$ 150,000
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$ 100,000
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Options granted to purchase shares |
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50,000
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Exercise price |
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$ 1.64
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Number of granted shares vested |
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12,500
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25,000
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37,500
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Number of shares vesting percentage |
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25.00%
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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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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 |
518,020
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518,020
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518,020
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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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12,500
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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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12,500
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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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12,500
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Research And Development Expense [Member] |
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Stock-based compensation expense recognized |
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$ 738,000
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200,000
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General And Administrative Expense [Member] |
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Stock-based compensation expense recognized |
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$ 527,000
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$ 400,000
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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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Individual [Member] | Stock Option Cancellation Agreement [Member] |
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Number of vested stock options cancelled |
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300,000
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Number of restricted stock issued |
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175,000
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Stock-based compensation expense recognized |
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$ 135,425
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Two Consultants [Member] | Stock Option Cancellation Agreement [Member] |
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Stock-based compensation expense recognized |
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$ 377,278
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Number of stock options cancelled |
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535,000
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Employees [Member] |
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Options granted to purchase shares |
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200,000
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Term of stock options |
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10 years
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Vesting period |
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3 years
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Exercise price |
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$ 1.64
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Consultants [Member] |
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Stock-based compensation expense recognized |
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$ 239,824
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$ 109,000
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Options granted to purchase shares |
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250,000
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Term of stock options |
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10 years
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Exercise price |
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$ 1.43
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Number of shares issued for service |
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184,000
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100,000
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Number of shares issued for service, value |
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$ 251,560
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$ 109,000
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Employees, Directors and Consultants [Member] |
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Stock-based compensation expense recognized |
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$ 1,300,000
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$ 600,000
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2011 Plan [Member] |
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Number of shares authorized for issuance to awards granted |
1,000,000
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1,000,000
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1,000,000
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Maximum shares granted per fiscal year per individual |
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8,500,000
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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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Provisional percentage of outstanding stock owned by stockholders |
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10.00%
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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] | Maximum [Member] |
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Maximum shares granted per fiscal year per individual |
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500,000
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Stock option exercisable period |
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10 years
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2011 Plan [Member] | Employee, Director and Consultants [Member] |
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Employee stock purchase program description |
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The 2011 Plan authorizes a total of 7,500,000 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) 1,000,000 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 |
7,500,000
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7,500,000
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7,500,000
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2011 Plan [Member] | Employees [Member] |
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Options granted to purchase shares |
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111,000
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163,500
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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 |
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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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$ 1.58
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$ 0.96
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2011 Plan [Member] | Employees [Member] | Minimum [Member] |
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Exercise price |
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$ 1.32
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$ 0.92
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2011 Plan [Member] | Consultants [Member] |
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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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Exercise price |
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$ 1.00
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2011 Plan [Member] | Directors [Member] |
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Options granted to purchase shares |
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200,000
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Term of stock options |
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10 years
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Vesting period |
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1 year
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2011 Plan [Member] | Directors [Member] | Maximum [Member] |
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Exercise price |
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$ 1.08
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2011 Plan [Member] | Directors [Member] | Minimum [Member] |
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Exercise price |
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$ 0.979
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ESPP [Member] |
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Number of shares authorized for issuance to awards granted |
410,903
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410,903
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410,903
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Purchase price of incentive stock options as a percentage of its fair value |
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85.00%
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Stock-based compensation expense recognized |
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$ 6,600
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$ 7,000
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Stock issued during period, shares, employee stock purchase plans |
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500,000
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Discount from market price, offering date |
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15.00%
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Fair market value of unvested shares, percentage |
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15.00%
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ESPP [Member] | Black-Scholes Option Valuation Model [Member] |
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Maturity |
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6 months
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Risk free interest rate |
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1.15%
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Volatility rate |
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62.60%
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Forfeitures percentage |
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0.00%
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Dividend |
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$ 0
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ESPP [Member] | January 31, 2019 [Member] | Black-Scholes Option Valuation Model [Member] |
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Maturity |
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6 months
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Risk free interest rate |
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2.22%
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Volatility rate |
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61.83%
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Forfeitures percentage |
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0.00%
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Dividend |
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$ 0
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ESPP [Member] | July 31, 2016 [Member] | First Offering Period [Member] |
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Shares purchased |
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17,789
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ESPP [Member] | January 31, 2017 [Member] | Second Offering Period [Member] |
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Shares purchased |
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18,631
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ESPP [Member] | July 31, 2017 [Member] | Third Offering Period [Member] |
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Shares purchased |
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21,646
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ESPP [Member] | January 31, 2018 [Member] | Fourth Offering Period [Member] |
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Shares purchased |
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18,960
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ESPP [Member] | July 31, 2018 [Member] | Fifth Offering Period [Member] |
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Shares purchased |
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12,071
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