Consolidated Statements of Changes in Stockholders' Equity - USD ($)		Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock		Additional paid-in Capital*		Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2017	[1]			10,056,329
Beginning balance at Dec. 31, 2017		$ 461,165,033	$ (787,110)	$ 100,563	[1]	$ 888,229,283	[1]	$ (427,164,813)	$ (787,110)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		12,574,684						12,574,684
Issuance of shares due to vesting of restricted shares (in shares)	[1]			94,442
Issuance of shares due to vesting of restricted shares and exercise of options, net of cash received		4,866		$ 945	[1]	3,921	[1]
Cash used to settle net share equity awards		(2,559,104)				(2,559,104)	[1]
Stock-based compensation		9,207,480				9,207,480	[1]
Unrealized loss on cash flow hedges		0
Ending balance (in shares) at Dec. 31, 2018	[1]			10,150,771
Ending balance at Dec. 31, 2018		479,605,849		$ 101,508	[1]	894,881,580	[1]	(415,377,239)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		(21,697,115)						(21,697,115)
Issuance of shares due to vesting of restricted shares (in shares)	[1]			63,829
Issuance of shares due to vesting of restricted shares and exercise of options, net of cash received	[1]			$ 638		(638)
Cash used to settle net share equity awards		(1,443,753)				(1,443,753)	[1]
Stock-based compensation		4,826,324				4,826,324	[1]
Proceeds received from the Share Lending Agreement		35,829				35,829	[1]
Equity component of Convertible Bond Debt, net of equity issuance costs		20,175,803				20,175,803	[1]
Unrealized loss on cash flow hedges		0
Ending balance (in shares) at Dec. 31, 2019	[1]			10,214,600
Ending balance at Dec. 31, 2019		481,502,937		$ 102,146	[1]	918,475,145	[1]	(437,074,354)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		(35,063,468)						(35,063,468)
Issuance of shares due to vesting of restricted shares (in shares)	[1]			65,982
Issuance of shares due to vesting of restricted shares and exercise of options, net of cash received		0		$ 660	[1]	(660)	[1]
Cash used to settle net share equity awards		(1,162,609)				(1,162,609)	[1]
Stock-based compensation		3,048,280				3,048,280	[1]
Issuance of common shares for Equity Offering (in shares)	[1]			1,381,215
Issuance of common shares for Equity Offerings		23,817,505		$ 13,812	[1]	23,803,693	[1]
Fees for Equity Offerings		(579,651)				(579,651)	[1]
Cash used to settle fractional shares in the Reverse Stock Split		(12,513)				(12,513)	[1]
Unrealized loss on cash flow hedges		(1,132,398)								(1,132,398)
Ending balance (in shares) at Dec. 31, 2020	[1]			11,661,797
Ending balance at Dec. 31, 2020		$ 470,418,083		$ 116,618	[1]	$ 943,571,685	[1]	$ (472,137,822)		$ (1,132,398)

[1] * Adjusted retroactively to give effect for the 1-for-7 Reverse Stock Split that became effective as of September 15, 2020, see Note 1.