Annual report pursuant to Section 13 and 15(d)

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

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Stock Options, Common Stock and Warrants - Warrants by Exercise Price (Details) - Row 44 Warrants
shares in Thousands
12 Months Ended
Dec. 31, 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 | $ / shares $ 8.79
Number of Warrants (in thousands) | shares 690
Weighted Average Remaining Life (in years) 1 year 2 months 20 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 | $ / shares $ 8.74
Number of Warrants (in thousands) | shares 477
Weighted Average Remaining Life (in years) 1 year 5 months 4 days