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Fair Value Measurements - Black-Scholes Inputs to Warrant Liability Valuation (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
2014 Offering  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Stock Price (in dollars per share) $ 5.92
Exercise Price (in dollars per share) $ 65.28
Expected Volatility 64.19%
Risk-Free Interest 1.33%
Expected Term 2 years 6 months
Dividends 0.00%
2013 Offering  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Stock Price (in dollars per share) $ 5.92
Exercise Price (in dollars per share) $ 64.00
Expected Volatility 71.61%
Risk-Free Interest 0.99%
Expected Term 1 year 5 months
Dividends 0.00%