Common Stock and Warrant Issuances - Summary of Warrant Outstanding (Details) - Warrant [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Warrants outstanding beginning | shares	100,000
Warrants outstanding Issued | shares	17,674,289
Warrants outstanding Exercised | shares	(3,677,186)
Warrants outstanding Expired or cancelled | shares	(376,361)
Warrants outstanding ending | shares	13,720,742
Warrants exercisable ending | shares	13,720,742
Weighted average exercise price beginning | $ / shares	$ 3.75
Weighted average exercise price Issued | $ / shares	1.35
Weighted average exercise price Exercised | $ / shares	0.74
Weighted average exercise price Expired | $ / shares	0.75
Weighted average exercise price ending | $ / shares	1.49
Weighted average exercise price exercisable ending | $ / shares	$ 1.49
Weighted average remaining life outstanding	2 years 10 months 24 days
Weighted average remaining life exercisable	2 years 10 months 24 days
Intrinsic value outstanding ending | $	$ 44,818
Intrinsic value exercisable ending | $	$ 44,818