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Equity Instruments and Stock Based Compensation - Fair Value Assumptions (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 2 years 4 months 6 days    
Excess tax benefit related to stock-based compensation $ 0    
Warrant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 0 years 0 years 2 years 6 months
Expected volatility 0.00% 0.00% 60.57%
Risk-free interest rate 0.00% 0.00% 0.82%
Expected dividend yield 0.00% 0.00% 0.00%
Aggregate intrinsic value of warrants exercised $ 0 $ 0 $ 0
Granted (in shares) 0 0  
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 years 3 months 6 years 3 months 6 years 3 months
Expected volatility 56.59% 58.82% 58.39%
Risk-free interest rate 2.68% 2.20% 2.04%
Expected dividend yield 0.00% 0.00% 0.00%