Condensed Consolidated Statements of Stockholders' Equity - USD ($)		Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2016			48,106,827
Beginning Balance at Dec. 31, 2016		$ 400,482,639	$ 481,069	$ 783,369,698	$ (383,368,128)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		(11,068,448)			(11,068,448)
Issuance of shares for private placement (in shares)			22,222,223
Issuance of shares for private placement		96,030,003	$ 222,222	95,807,781
Stock-based compensation		2,170,700		2,170,700
Ending Balance (in shares) at Mar. 31, 2017			70,329,050
Ending Balance at Mar. 31, 2017		487,614,894	$ 703,291	881,348,179	(394,436,576)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	[1]	(787,110)			(787,110)
Beginning Balance (in shares) at Dec. 31, 2017			70,394,307
Beginning Balance at Dec. 31, 2017		461,165,033	$ 703,944	887,625,902	(427,164,813)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		52,745			52,745
Issuance of shares for private placement (in shares)			120,711
Issuance of shares for private placement		0	$ 1,207	(1,207)
Cash used to settle net share equity awards		(254,146)		(254,146)
Stock-based compensation		3,510,911		3,510,911
Ending Balance (in shares) at Mar. 31, 2018			70,515,018
Ending Balance at Mar. 31, 2018		$ 463,687,433	$ 705,151	$ 890,881,460	$ (427,899,178)

[1] The opening retained earnings has been adjusted on January 1, 2018 in connection with adoption of Accounting Standards Update 2014-09 ("ASC 606"). Please refer to Note 2 "Recently Adopted Accounting Pronouncements" to the condensed consolidated financial statements.