Annual report pursuant to section 13 and 15(d)

Subsequent Events (Details)

v2.4.0.8
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