Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2019	$ 27,779,543	$ 3,908	$ 314,511,853	$ (286,736,218)
Balance (in shares) at Dec. 31, 2019		39,084,121
Exercise of stock options	797,629	$ 14	797,615
Exercise of stock options (in shares)		135,013
Stock-based compensation	2,198,187		2,198,187
Net income (loss)	(12,151,165)			(12,151,165)
Balance at Mar. 31, 2020	18,624,194	$ 3,922	317,507,655	(298,887,383)
Balance (in shares) at Mar. 31, 2020		39,219,134
Balance at Dec. 31, 2019	27,779,543	$ 3,908	314,511,853	(286,736,218)
Balance (in shares) at Dec. 31, 2019		39,084,121
Net income (loss)	9,265,598
Balance at Sep. 30, 2020	58,022,903	$ 4,267	335,489,256	(277,470,620)
Balance (in shares) at Sep. 30, 2020		42,674,491
Balance at Dec. 31, 2019	27,779,543	$ 3,908	314,511,853	(286,736,218)
Balance (in shares) at Dec. 31, 2019		39,084,121
Balance at Dec. 31, 2020	$ 52,662,601	$ 4,272	337,453,776	(284,795,447)
Balance (in shares) at Dec. 31, 2020	42,721,566	42,721,566
Balance at Mar. 31, 2020	$ 18,624,194	$ 3,922	317,507,655	(298,887,383)
Balance (in shares) at Mar. 31, 2020		39,219,134
Issuance of common stock in public offering	5,178,460	$ 136	5,178,324
Issuance of common stock in public offering (in shares)		1,361,956
Costs related to issuance of common stock	(219,517)		(219,517)
Exercise of stock options	346,026	$ 7	346,019
Exercise of stock options (in shares)		63,749
Stock-based compensation	3,485,482		3,485,482
Net income (loss)	29,529,376			29,529,376
Balance at Jun. 30, 2020	56,944,021	$ 4,065	326,297,963	(269,358,007)
Balance (in shares) at Jun. 30, 2020		40,644,839
Issuance of common stock in public offering	7,371,609	$ 201	7,371,408
Issuance of common stock in public offering (in shares)		2,019,652
Costs related to issuance of common stock	(236,149)		(236,149)
Vesting of restricted stock units		$ 1	(1)
Vesting of restricted stock units (in shares)		10,000
Stock-based compensation	2,056,035		2,056,035
Net income (loss)	(8,112,613)			(8,112,613)
Balance at Sep. 30, 2020	58,022,903	$ 4,267	335,489,256	(277,470,620)
Balance (in shares) at Sep. 30, 2020		42,674,491
Balance at Dec. 31, 2020	$ 52,662,601	$ 4,272	337,453,776	(284,795,447)
Balance (in shares) at Dec. 31, 2020	42,721,566	42,721,566
Stock-based compensation	$ 1,516,064		1,516,064
Net income (loss)	(8,804,733)			(8,804,733)
Balance at Mar. 31, 2021	45,373,932	$ 4,272	338,969,840	(293,600,180)
Balance (in shares) at Mar. 31, 2021		42,721,566
Balance at Dec. 31, 2020	$ 52,662,601	$ 4,272	337,453,776	(284,795,447)
Balance (in shares) at Dec. 31, 2020	42,721,566	42,721,566
Net income (loss)	$ (28,599,303)
Balance at Sep. 30, 2021	$ 28,077,948	$ 4,272	341,468,426	(313,394,750)
Balance (in shares) at Sep. 30, 2021	42,721,566	42,721,566
Balance at Mar. 31, 2021	$ 45,373,932	$ 4,272	338,969,840	(293,600,180)
Balance (in shares) at Mar. 31, 2021		42,721,566
Stock-based compensation	1,384,060		1,384,060
Net income (loss)	(10,589,163)			(10,589,163)
Balance at Jun. 30, 2021	36,168,829	$ 4,272	340,353,900	(304,189,343)
Balance (in shares) at Jun. 30, 2021		42,721,566
Stock-based compensation	1,114,526		1,114,526
Net income (loss)	(9,205,407)			(9,205,407)
Balance at Sep. 30, 2021	$ 28,077,948	$ 4,272	$ 341,468,426	$ (313,394,750)
Balance (in shares) at Sep. 30, 2021	42,721,566	42,721,566