Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Warrants by Exercise Price (Details)

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Stock Options and Warrants - Warrants by Exercise Price (Details) - Row 44 Warrants
shares in Thousands
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Common stock warrants  
Share-based Compensation, Shares Authorized under Equity Instruments Other Than Options, Exercise Price Range [Line Items]  
Weighted Average Exercise Price per Warrant (usd per share) $ 8.79
Number of Warrants (as converted) | shares 690
Weighted Average Remaining Life (in years) 1 year 5 months 19 days
Series C-2 Warrants  
Share-based Compensation, Shares Authorized under Equity Instruments Other Than Options, Exercise Price Range [Line Items]  
Weighted Average Exercise Price per Warrant (usd per share) $ 8.74
Number of Warrants (as converted) | shares 734
Weighted Average Remaining Life (in years) 1 year 8 months 4 days