Condensed Statements of Shareholders' Equity (Unaudited) - USD ($)	Total	March 2, 2020 Financing Transaction [Member]	March 4, 2020 Financing Transaction [Member]	December 2019 Financing Transaction Overallotment [Member]	April 2020 Financing Transaction [Member]	ATM Transaction [Member]	Common Stock [Member]	Common Stock [Member] Cashless Warrants [Member]	Common Stock [Member] March 2, 2020 Financing Transaction [Member]	Common Stock [Member] March 4, 2020 Financing Transaction [Member]	Common Stock [Member] December 2019 Financing Transaction Overallotment [Member]	Common Stock [Member] April 2020 Financing Transaction [Member]	Common Stock [Member] ATM Transaction [Member]	SeriesA Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Cashless Warrants [Member]	Additional Paid-in Capital [Member] March 2, 2020 Financing Transaction [Member]	Additional Paid-in Capital [Member] March 4, 2020 Financing Transaction [Member]	Additional Paid-in Capital [Member] December 2019 Financing Transaction Overallotment [Member]	Additional Paid-in Capital [Member] April 2020 Financing Transaction [Member]	Additional Paid-in Capital [Member] ATM Transaction [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2019	$ 11,200,643						$ 547								$ 256,917,285							$ (245,717,189)
Beginning balance, shares at Dec. 31, 2019							5,473,848							2,133
Stock-based compensation expense	142,964														142,964
Shares issued upon exercise of common stock warrants	2,306,708						$ 70	$ 61							2,306,638	$ (61)
Shares issued upon exercise of common stock warrants, shares							696,141	608,000
Deemed dividends related to warrants downround provision															2,774							(2,774)
Shares and warrants issued, net of issuance costs		$ 8,565,500	$ 6,093,561	$ 659,958					$ 230	$ 160	$ 19						$ 8,565,270	$ 6,093,401	$ 659,939
Shares and warrants issued, net of issuance costs, shares									2,300,000	1,600,000	192,750
Warrant inducement expense	2,102,109														2,102,109
Net income (loss)	(8,341,338)																					(8,341,338)
Ending balance at Mar. 31, 2020	22,730,105						$ 1,087								276,790,319							(254,061,301)
Ending balance, shares at Mar. 31, 2020							10,870,739							2,133
Beginning balance at Dec. 31, 2019	11,200,643						$ 547								256,917,285							(245,717,189)
Beginning balance, shares at Dec. 31, 2019							5,473,848							2,133
Deemed dividends related to warrants downround provision	2,774
Net income (loss)	(14,830,641)
Ending balance at Jun. 30, 2020	26,084,943						$ 1,312								286,634,235							(260,550,604)
Ending balance, shares at Jun. 30, 2020							13,121,323							2,133
Beginning balance at Dec. 31, 2019	11,200,643						$ 547								256,917,285							(245,717,189)
Beginning balance, shares at Dec. 31, 2019							5,473,848							2,133
Net income (loss)	(17,800,000)
Ending balance at Dec. 31, 2020	23,692,422						$ 1,340								287,217,949							(263,526,867)
Ending balance, shares at Dec. 31, 2020							13,397,041							2,111
Beginning balance at Mar. 31, 2020	22,730,105						$ 1,087								276,790,319							(254,061,301)
Beginning balance, shares at Mar. 31, 2020							10,870,739							2,133
Stock-based compensation expense	194,236														194,236
Shares issued upon exercise of common stock warrants	72,608						$ 2								72,606
Shares issued upon exercise of common stock warrants, shares							20,584
Shares and warrants issued, net of issuance costs					$ 9,577,297							$ 223								$ 9,577,074
Shares and warrants issued, net of issuance costs, shares												2,230,000
Net income (loss)	(6,489,303)																					(6,489,303)
Ending balance at Jun. 30, 2020	26,084,943						$ 1,312								286,634,235							(260,550,604)
Ending balance, shares at Jun. 30, 2020							13,121,323							2,133
Beginning balance at Dec. 31, 2020	23,692,422						$ 1,340								287,217,949							(263,526,867)
Beginning balance, shares at Dec. 31, 2020							13,397,041							2,111
Stock-based compensation expense	460,201														460,201
Shares issued upon conversion of preferred stock, shares							23
Shares issued upon exercise of options	760														760
Shares issued upon exercise of options, shares							194
Shares issued upon exercise of common stock warrants	18,552														18,552
Shares issued upon exercise of common stock warrants, shares							5,304
Net income (loss)	2,599,292																					2,599,292
Ending balance at Mar. 31, 2021	26,771,227						$ 1,340								287,697,462							(260,927,575)
Ending balance, shares at Mar. 31, 2021							13,402,562							2,111
Beginning balance at Dec. 31, 2020	$ 23,692,422						$ 1,340								287,217,949							(263,526,867)
Beginning balance, shares at Dec. 31, 2020							13,397,041							2,111
Shares issued upon exercise of options, shares	194
Net income (loss)	$ 771,813
Ending balance at Jun. 30, 2021	29,351,823						$ 1,431								292,105,446							(262,755,054)
Ending balance, shares at Jun. 30, 2021							14,310,606							2,111
Beginning balance at Mar. 31, 2021	26,771,227						$ 1,340								287,697,462							(260,927,575)
Beginning balance, shares at Mar. 31, 2021							13,402,562							2,111
Stock-based compensation expense	$ 494,330														494,330
Shares and warrants issued, net of issuance costs						$ 3,913,745							$ 91								$ 3,913,654
Shares and warrants issued, net of issuance costs, shares	908,044												908,044
Net income (loss)	$ (1,827,479)																					(1,827,479)
Ending balance at Jun. 30, 2021	$ 29,351,823						$ 1,431								$ 292,105,446							$ (262,755,054)
Ending balance, shares at Jun. 30, 2021							14,310,606							2,111