Quarterly report pursuant to Section 13 or 15(d)

Series B Warrant and Emerald Warrant Liabilities (Details 1)

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Series B Warrant and Emerald Warrant Liabilities (Details 1) - Emerald Warrant Liabilities - $ / shares
2 Months Ended 3 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Class of Warrant or Right [Line Items]    
Dividend yield 0.00% 0.00%
Volatility factor 70.00% 70.00%
Expected term (years) 5 years  
Closing price per share of common stock   $ 0.24
Minimum    
Class of Warrant or Right [Line Items]    
Risk-free interest rate 2.45% 2.54%
Expected term (years)   4 years 9 months 18 days
Closing price per share of common stock $ 0.29  
Maximum    
Class of Warrant or Right [Line Items]    
Risk-free interest rate 2.60% 2.55%
Expected term (years)   4 years 10 months 17 days
Closing price per share of common stock $ 0.30