Quarterly report pursuant to Section 13 or 15(d)

Series B Warrant and Emerald Warrant Liabilities (Details)

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Series B Warrant and Emerald Warrant Liabilities (Details) - Series B Warrants - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Dividend yield 0.00% 0.00%
Volatility factor 70.00% 70.00%
Risk-free interest rate 1.95%
Expected term (years) 2 years 3 months  
Weighted-average fair value of warrants $ 0.238 $ 0.086
Maximum    
Class of Warrant or Right [Line Items]    
Risk-free interest rate   1.949%
Expected term (years)   2 years 7 months 24 days
Minimum    
Class of Warrant or Right [Line Items]    
Risk-free interest rate   1.947%
Expected term (years)   2 years 7 months 21 days