Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments - Warrant Liability Assumptions (Details)

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Fair Value of Financial Instruments - Warrant Liability Assumptions (Details) - Warrants - Common Stock - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 23, 2015
Sep. 19, 2014
Lenders and Placement Agent        
Warrants        
Number of shares called upon exercise of warrants (in shares)     42,639 42,639
Level 3        
Fair value assumptions        
Estimated remaining term 6 years 3 months 18 days 7 years 3 months 18 days    
Risk-free interest rate (as a percent) 2.00% 2.00%    
Volatility (as a percent) 67.40% 71.80%    
Dividend yield (as a percent) 0.00% 0.00%    
Fair value of underlying instrument (in dollar per share) $ 10.50 $ 5.98