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Fair Value Measurements - Black-Scholes Inputs to Warrant Liability Valuation (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 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) $ 2.69 $ 5.92
Exercise Price (in dollars per share) $ 5.60 $ 65.28
Expected Volatility 69.05% 64.19%
Risk-Free Interest 1.37% 1.33%
Expected Term 2 years 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) $ 2.69 $ 5.92
Exercise Price (in dollars per share) $ 5.60 $ 64.00
Expected Volatility 70.38% 71.61%
Risk-Free Interest 1.24% 0.99%
Expected Term 11 months 1 year 5 months
Dividends 0.00% 0.00%