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Fair Value Measurements - Black-Scholes Inputs to Warrant Liability Valuation (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
2014 Offering    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stock Price (in dollars per share) $ 0.62 $ 0.74
Exercise Price (in dollars per share) $ 0.70 $ 8.16
Expected Volatility 67.57% 64.19%
Risk-Free Interest 1.32% 1.33%
Expected Term 2 years 3 months 2 years 6 months
Dividends 0.00% 0.00%
2013 Offering    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stock Price (in dollars per share) $ 0.62 $ 0.74
Exercise Price (in dollars per share) $ 0.70 $ 8.00
Expected Volatility 68.27% 71.61%
Risk-Free Interest 1.07% 0.99%
Expected Term 1 year 2 months 1 year 5 months
Dividends 0.00% 0.00%