CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2019	$ 5,932	$ 290,903,772	$ (264,716,555)	$ 26,193,149
Balance (in shares) at Dec. 31, 2019	59,318,355
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	676,548	0	676,548
Issuance of common stock, net of offering expenses	$ 2,703	88,701,336	0	88,704,039
Issuance of common stock, net of offering expenses (in shares)	27,025,000
Exercise of stock options	$ 0	7,177	0	7,177
Exercise of stock options (in shares)	1,958
Net loss	$ 0	0	(19,245,230)	(19,245,230)
Balance at Mar. 31, 2020	$ 8,635	380,288,833	(283,961,785)	96,335,683
Balance (in shares) at Mar. 31, 2020	86,345,313
Balance at Dec. 31, 2019	$ 5,932	290,903,772	(264,716,555)	26,193,149
Balance (in shares) at Dec. 31, 2019	59,318,355
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(56,340,774)
Balance at Sep. 30, 2020	$ 8,962	392,424,321	(321,057,329)	71,375,954
Balance (in shares) at Sep. 30, 2020	89,616,176
Balance at Mar. 31, 2020	$ 8,635	380,288,833	(283,961,785)	96,335,683
Balance (in shares) at Mar. 31, 2020	86,345,313
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	715,608	0	715,608
Exercise of stock options	$ 0	6,255	0	6,255
Exercise of stock options (in shares)	4,668
Net loss	$ 0	0	(20,178,091)	(20,178,091)
Balance at Jun. 30, 2020	$ 8,635	381,010,696	(304,139,876)	76,879,455
Balance (in shares) at Jun. 30, 2020	86,349,981
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	774,784	0	774,784
Vesting of restricted stock units	$ 2	(2)	0	0
Vesting of restricted stock units (in shares)	15,000
Issuance of common stock, net of offering expenses	$ 325	10,638,843	0	10,639,168
Issuance of common stock, net of offering expenses (in shares)	3,251,195
Net loss	$ 0	0	(16,917,453)	(16,917,453)
Balance at Sep. 30, 2020	$ 8,962	392,424,321	(321,057,329)	71,375,954
Balance (in shares) at Sep. 30, 2020	89,616,176
Balance at Dec. 31, 2020	$ 10,490	428,704,039	(340,465,103)	88,249,426
Balance (in shares) at Dec. 31, 2020	104,902,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	781,397	0	781,397
Vesting of Restricted Stock Units, net of shares withheld for taxes and retired	$ 6	(59,317)	0	(59,311)
Vesting of Restricted Stock Units, net of shares withheld for taxes and retired (in shares)	61,385
Issuance of common stock, net of offering expenses	$ 1,808	41,910,707	0	41,912,515
Issuance of common stock, net of offering expenses (in shares)	18,080,708
Net loss	$ 0	0	(18,379,941)	(18,379,941)
Balance at Mar. 31, 2021	$ 12,304	471,336,826	(358,845,044)	112,504,086
Balance (in shares) at Mar. 31, 2021	123,044,981
Balance at Dec. 31, 2020	$ 10,490	428,704,039	(340,465,103)	88,249,426
Balance (in shares) at Dec. 31, 2020	104,902,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(54,998,198)
Balance at Sep. 30, 2021	$ 13,831	498,229,637	(395,463,301)	102,780,167
Balance (in shares) at Sep. 30, 2021	138,313,817
Balance at Mar. 31, 2021	$ 12,304	471,336,826	(358,845,044)	112,504,086
Balance (in shares) at Mar. 31, 2021	123,044,981
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	805,189	0	805,189
Issuance of common stock, net of offering expenses	$ 883	17,188,677	0	17,189,560
Issuance of common stock, net of offering expenses (in shares)	8,827,045
Net loss	$ 0	0	(18,905,303)	(18,905,303)
Balance at Jun. 30, 2021	$ 13,187	489,330,692	(377,750,347)	111,593,532
Balance (in shares) at Jun. 30, 2021	131,872,026
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	688,274	0	688,274
Vesting of Restricted Stock Units, net of shares withheld for taxes and retired	$ 0	(2,287)	0	(2,287)
Vesting of Restricted Stock Units, net of shares withheld for taxes and retired (in shares)	3,515
Issuance of common stock, net of offering expenses	$ 644	8,212,958	0	8,213,602
Issuance of common stock, net of offering expenses (in shares)	6,438,276
Net loss	$ 0	0	(17,712,954)	(17,712,954)
Balance at Sep. 30, 2021	$ 13,831	$ 498,229,637	$ (395,463,301)	$ 102,780,167
Balance (in shares) at Sep. 30, 2021	138,313,817