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, USD $)
6 Months Ended
Jun. 30, 2014
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) $ 9.45
Number of Warrants (as converted) 721,600
Weighted Average Remaining Life (in years) 2 years 7 months 13 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) 734,451
Weighted Average Remaining Life (in years) 2 years 11 months 9 days