Stockholders' Equity and Redeemable Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Warrants [Abstract]
Warrants, Outstanding at beginning	$ 1,249,754
Warrants, Outstanding at ending	1,249,754	$ 1,249,754
Warrants, Exercisable	$ 1,249,754
Warrants, Weighted Average Exercise Price [Abstract]
Warrants. Weighted average exercise price at beginning	$ 8.98
Warrants, Weighted average exercise price at ending	8.98	$ 8.98
Warrants, Exercisable of weighted average exercise price	$ 8.98
Warrants, Total Intrinsic Value [Abstract]
Warrants, Intrinsic value at beginning
Warrants, Intrinsic value at ending
Warrants, Intrinsic value exercisable
Warrants, Weighted Average Remaining Contractual Life [Abstract]
Warrants, Weighted average remaining contractual life at beginning	2 years 8 months 12 days	2 years 11 months 1 day
Warrants, Weighted average remaining contractual life at ending	2 years 8 months 12 days	2 years 11 months 1 day
Warrants, Weighted average remaining exercisable	2 years 8 months 1 day