Quarterly report pursuant to Section 13 or 15(d)

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

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Common Stock, Stock Options and Warrants - Warrants by Exercise Price (Details) - Row 44 Warrants
shares in Thousands
6 Months Ended
Jun. 30, 2016
$ / 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) | $ / shares $ 8.79
Number of warrants, as converted (in shares) | shares 690
Weighted average remaining life 8 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) | $ / shares $ 8.62
Number of warrants, as converted (in shares) | shares 477
Weighted average remaining life 11 months 8 days