Common Stock Warrants (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Assumptions used in valuing warrant

The following assumptions were used in valuing the PIPE Warrants:

	December 31, 2016
Risk-free interest rate	0.85	%
Expected dividend yield	—	%
Expected term (in years)	0.92
Expected volatility	83.39	%