Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Total	Common Stock	Additional paid-in Capital	Accumulated Deficit
Balance (in shares) at Dec. 31, 2014		1,875,227
Balance at Dec. 31, 2014	$ 664,090,666	$ 18,752	$ 675,620,642	$ (11,548,728)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(148,296,965)			(148,296,965)
Vesting of restricted shares withheld for employee tax (in shares)		8,076
Vesting of restricted shares withheld for employee tax	(1,419,228)	$ 81	(1,419,309)
Stock-based compensation	3,969,989		3,969,989
Balance (in shares) at Dec. 31, 2015		1,883,303
Balance at Dec. 31, 2015	518,344,462	$ 18,833	678,171,322	(159,845,693)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(223,522,435)			(223,522,435)
Vesting of restricted shares withheld for employee tax (in shares)		410
Vesting of restricted shares withheld for employee tax	(2,938)	$ 4	(2,942)
Issuance of shares in connection with Second Lien Loan Agreement (in shares)		16,889,828
Issuance of shares in connection with Second Lien Loan Agreement	17,756,325	$ 168,899	17,587,426
Issuance of shares for private placement, net of issuance costs (in shares)		29,333,318
Issuance of shares for private placement, net of issuance costs	85,700,535	$ 293,333	85,407,202
Reverse stock split adjustment (in shares)		(32)
Stock-based compensation	2,206,690		2,206,690
Balance (in shares) at Dec. 31, 2016		48,106,827
Balance at Dec. 31, 2016	400,482,639	$ 481,069	783,369,698	(383,368,128)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(43,796,685)			(43,796,685)
Vesting of restricted shares withheld for employee tax (in shares)		65,257
Vesting of restricted shares withheld for employee tax	(289,539)	$ 653	(290,192)
Issuance of shares for private placement, net of issuance costs (in shares)		22,222,223
Issuance of shares for private placement, net of issuance costs	96,030,003	$ 222,222	95,807,781
Stock-based compensation	8,738,615		8,738,615
Balance (in shares) at Dec. 31, 2017		70,394,307
Balance at Dec. 31, 2017	$ 461,165,033	$ 703,944	$ 887,625,902	$ (427,164,813)