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, USD $)
3 Months Ended
Mar. 31, 2014
Common stock warrants
 
Share-based Compensation, Shares Authorized under Equity Instruments Other Than Options, Exercise Price Range [Line Items]  
Exercise Price Per Warrant (as converted) $ 9.45
Number of Warrants (as converted) 721,897
Weighted Average Remaining Life (in years) 2 years 10 months 12 days
Series C-2 Warrants
 
Share-based Compensation, Shares Authorized under Equity Instruments Other Than Options, Exercise Price Range [Line Items]  
Exercise Price Per Warrant (as converted) $ 8.74
Number of Warrants (as converted) 734,451
Weighted Average Remaining Life (in years) 3 years 2 months 10 days