Common Stock and Warrant Issuances - Summary of Warrant Outstanding (Details) - Warrants [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Warrant shares outstanding, beginning | shares	13,720,742
Warrant shares outstanding, issued | shares
Warrant shares outstanding, additional warrants issued for trigger of anti-dilution protection | shares	1,000,000
Warrant shares outstanding, exercised | shares	(5,179,947)
Warrant shares outstanding, expired or cancelled | shares	(100,000)
Warrant shares outstanding, ending | shares	9,440,795
Warrant shares exercisable, ending | shares	9,440,795
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	0.93
Weighted average exercise price, expired | $ / shares	3.75
Weighted average exercise price, ending | $ / shares	0.79
Weighted average exercise price exercisable, ending | $ / shares	$ 0.79
Weighted average remaining life, outstanding	2 years 11 months 1 day
Weighted average remaining life, exercisable	2 years 11 months 1 day
Intrinsic value outstanding, ending | $	$ 1,352
Intrinsic value exercisable, ending | $	$ 1,352