|
Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
1 Months Ended | 0 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Mar. 31, 2012
|
Jun. 30, 2011
|
Dec. 12, 2012
|
Jun. 24, 2011
|
Jul. 31, 2013
Maximum
|
Mar. 28, 2012
Placement Agents
|
Sep. 18, 2013
Warrants issued with September 2013 Public Offering
|
Sep. 18, 2013
Subsequent events
Warrants issued with September 2013 Public Offering
|
Sep. 18, 2013
Subsequent events
Warrants issued with September 2013 Public Offering
Maximum
|
Sep. 18, 2013
Subsequent events
Warrants issued with September 2013 Public Offering
Placement Agents
|
|
| Subsequent events | |||||||||||
| Shares issued in offering | 28,800,000 | 31,000,000 | 4,000,000 | 47,792,000 | 47,792,000 | ||||||
| Number of common shares that can be acquired upon exercise of warrants | 12,000,000 | 23,896,000 | 23,896,000 | ||||||||
| Gross proceeds from issuance of common stock and warrants | $ 7.20 | $ 7.75 | $ 11.95 | ||||||||
| Warrants exercise price (in dollars per share) | $ 0.26 | $ 1.20 | $ 0.3125 | $ 0.35 | $ 0.3125 | ||||||
| Term of warrants | 4 years | ||||||||||
| Net, proceeds from issuance of common stock and warrants | $ 6.7 | $ 7.2 | $ 11.1 | $ 11.1 | |||||||
| Placement agent fees as a percentage of offering proceeds | 6.00% | 6.00% | 6.00% | ||||||||
| Reimbursement of expenses to lead placement agent (as a percent) | 1.00% | ||||||||||
| Percentage of warrants issued to placement agents | 5.00% | 6.00% | 5.00% | ||||||||
| Warrants issued to placement agents (in shares) | 1,440,000 | 1,550,000 | 240,000 | 2,389,600 | |||||||