Common Stock and Warrant Issuances - Summary of Warrant Outstanding (Details) - Warrant [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Warrants outstanding, beginning | shares	13,720,742
Warrants outstanding, issued | shares
Warrants outstanding, additional warrants issued for trigger of anti-dilution protection | shares	1,000,000
Warrants outstanding, exercised | shares	(3,686,100)
Warrants outstanding, expired or cancelled | shares
Warrants outstanding, ending | shares	11,034,642
Warrants exercisable, ending | shares	11,034,642
Weighted average exercise price, beginning | $ / shares	$ 1.49
Weighted average exercise price, issued | $ / shares
Weighted average exercise price, additional warrants issued for trigger of anti-dilution protection | $ / shares	0.40
Weighted average exercise price, exercised | $ / shares	1.09
Weighted average exercise price, expired | $ / shares
Weighted average exercise price, ending | $ / shares	0.79
Weighted average exercise price exercisable, ending | $ / shares	$ 0.79
Weighted average remaining life, outstanding	3 years 15 days
Weighted average remaining life, exercisable	3 years 15 days
Intrinsic value outstanding, ending | $	$ 6,476
Intrinsic value exercisable, ending | $	$ 6,476