Quarterly report pursuant to Section 13 or 15(d)

Warrant Liability - Assumptions Used and Summary of Warrant Liability (Details)

v3.8.0.1
Warrant Liability - Assumptions Used and Summary of Warrant Liability (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Warrant    
Weighted Average Remaining Contractual Life (Years)    
Weighted Average Remaining Contractual Life, Granted (in years) 0 years  
Weighted Average Remaining Contractual Life, Exercised (in years) 0 years  
Weighted Average Remaining Contractual Life, Expired (in years) 0 years  
Minimum | Warrant    
Number of Shares Under Warrant    
Range of Warrant Price Per Share, Granted (in dollars per share) $ 1.35  
Maximum | Warrant    
Number of Shares Under Warrant    
Range of Warrant Price Per Share, Granted (in dollars per share) $ 1.50  
2018 Warrants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00%  
Number of Shares Under Warrant    
Number of Shares Under Warrant, balance at beginning of period 0  
Number of shares under warrant, granted 2,273,700  
Number of shares under warrant, exercised 0  
Number of shares under warrant, expired 0  
Number of Shares Under Warrant, balance at end of period 2,273,700 0
Number of Shares Under Warrant, Vested and Exercisable at end of period 2,273,700  
Range of Warrant Price Per Share, Granted (in dollars per share) $ 2.80  
Range of Warrant Price per Share, Outstanding, end of period (in dollars per share) 2.80  
Range of Warrant Price Per Share, Vested and Exercisable at end of period (in dollars per share) 2.80  
Weighted Average Exercise Price    
Weighted Average Exercise Price, balance at beginning of period (in dollars per share) 0.00  
Weighted Average Exercise Price, Granted (in dollars per share) 2.80  
Weighted Average Exercise Price, Exercised (in dollars per share) 0.00  
Weighted Average Exercise Price, Expired (in dollars per share) 0.00  
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share) 2.80  
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share) $ 2.80  
Weighted Average Remaining Contractual Life (Years)    
Weighted Average Remaining Contractual Life, Balance (in years) 5 years 6 months  
Weighted Average Remaining Contractual Life, Granted (in years) 5 years 6 months  
2018 Warrants | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.58%  
Volatility rate 80.00%  
Expected life (years) 5 years 4 months 17 days  
2018 Warrants | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.68%  
Volatility rate 85.00%  
Expected life (years) 5 years 6 months  
2017 Warrants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility rate 80.00%  
Dividend yield 0.00% 0.00%
Number of Shares Under Warrant    
Range of Warrant Price per Share, Outstanding, end of period (in dollars per share) $ 1.50  
2017 Warrants | Warrant    
Number of Shares Under Warrant    
Number of Shares Under Warrant, balance at beginning of period 419,772  
Number of shares under warrant, granted 0  
Number of shares under warrant, exercised (9,752)  
Number of shares under warrant, expired 0  
Number of Shares Under Warrant, balance at end of period 410,020 419,772
Number of Shares Under Warrant, Vested and Exercisable at end of period 410,020  
Range of Warrant Price Per Share, Vested and Exercisable at end of period (in dollars per share) $ 1.50  
Weighted Average Exercise Price    
Weighted Average Exercise Price, balance at beginning of period (in dollars per share) 1.46  
Weighted Average Exercise Price, Granted (in dollars per share) 0.00  
Weighted Average Exercise Price, Exercised (in dollars per share) 1.50  
Weighted Average Exercise Price, Expired (in dollars per share) 0.00  
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share) 1.50  
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share) $ 1.50  
Weighted Average Remaining Contractual Life (Years)    
Weighted Average Remaining Contractual Life, Balance (in years) 3 years 10 months 17 days 4 years 4 months 17 days
Weighted Average Remaining Contractual Life, Vested and Exercisable at end of period (in years) 3 years 10 months 17 days  
2017 Warrants | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.46% 1.68%
Volatility rate   80.00%
Expected life (years) 3 years 10 months 13 days 6 months
2017 Warrants | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.55% 1.86%
Volatility rate   160.11%
Expected life (years) 3 years 11 months 16 days 5 years