Warrants - Summary of Warrant Activity (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Increase (Decrease) in Warrants Outstanding [Roll Forward]
Number of warrants outstanding (shares), beginning balance | shares	5,666,779
Number of warrants granted during the period (shares) | shares	18,087,500
Number of warrants adjusted during the period (shares) | shares	154,288
Number of warrants exercised during the period (shares) | shares	0
Number of warrants expired during the period (share) | shares	(2,912,378)
Number of warrants outstanding (shares), ending balance | shares	20,996,189
Warrants exercise price (usd per share), beginning balance | $ / shares	$ 7.14
Weighted-average exercise price, warrants granted during the period (usd per share) | $ / shares	1.50
Weighted-average exercise price, warrants adjusted during the period (usd per share) | $ / shares	0.70
Weighted-average exercise price, warrants exercised during the period (usd per share) | $ / shares	0.00
Weighted-average exercise price, warrants expired during the period (usd per share) | $ / shares	8.84
Warrants exercise price (usd per share), ending balance | $ / shares	$ 1.99