Statements of Convertible Preferred Stock and Stockholders' Equity (Unaudited) - USD ($)	Convertible Preferred Stock Series A [Member]	Convertible preferred stock series B [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2019	$ 5,758,190	$ 5,610	$ 68,530	$ 504,211,040	$ (205,999)	$ (481,312,774)	$ 22,766,407
Balance, shares at Dec. 31, 2019	23,110	5,610,121	68,529,623
Issuance of common stock			$ 3,856	15,051,062			15,054,918
Issuance of common stock, shares			3,856,045
Share-based compensation			$ 148	2,413,286			2,413,434
Share-based compensation, shares			147,739
Components of net loss						(5,465,609)	(5,465,609)
Employee stock purchase plan			$ 24	91,093			91,117
Employee stock purchase plan, shares			23,989
Preferred stock conversion	$ (152,867)		$ 1,120	151,747			152,867
Preferred stock conversion, shares	(597)		1,120,810
Ending balance, value at Sep. 30, 2020	$ 5,605,323	$ 5,610	$ 73,678	521,918,228	(205,999)	(486,778,383)	35,013,134
Balance, shares at Sep. 30, 2020	22,513	5,610,121	73,678,206
Beginning balance, value at Jun. 30, 2020	$ 5,682,141	$ 5,610	$ 73,031	521,013,702	(205,999)	(485,205,411)	35,680,933
Balance, shares at Jun. 30, 2020	22,813	5,610,121	73,030,824
Issuance of common stock			$ 41	46,508			46,549
Issuance of common stock, shares			40,953
Share-based compensation			$ 31	755,682			755,713
Share-based compensation, shares			30,750
Components of net loss						(1,572,972)	(1,572,972)
Employee stock purchase plan			$ 6	26,087			26,093
Employee stock purchase plan, shares			6,154
Preferred stock conversion	$ (76,818)		$ 569	76,249			76,818
Preferred stock conversion, shares	(300)		569,525
Ending balance, value at Sep. 30, 2020	$ 5,605,323	$ 5,610	$ 73,678	521,918,228	(205,999)	(486,778,383)	35,013,134
Balance, shares at Sep. 30, 2020	22,513	5,610,121	73,678,206
Beginning balance, value at Dec. 31, 2020	$ 5,605,323	$ 5,610	$ 73,694	522,709,846	(205,999)	(487,959,233)	34,623,918
Balance, shares at Dec. 31, 2020	22,513	5,610,121	73,694,203
Issuance of common stock			$ 300	446,088			446,388
Issuance of common stock, shares			298,730
Share-based compensation			$ 325	6,753,015			6,753,340
Share-based compensation, shares			325,954
Components of net loss						(7,361,354)	(7,361,354)
Employee stock purchase plan			$ 14	89,281			89,295
Employee stock purchase plan, shares			14,159
Preferred stock conversion	$ (21,555)		$ 246	21,309			21,555
Preferred stock conversion, shares	(126)		246,152
Ending balance, value at Sep. 30, 2021	$ 5,583,768	$ 5,610	$ 74,579	530,019,539	(205,999)	(495,320,587)	34,573,142
Balance, shares at Sep. 30, 2021	22,387	5,610,121	74,579,198
Beginning balance, value at Jun. 30, 2021	$ 5,578,181	$ 5,610	$ 74,429	527,294,470	(205,999)	(490,702,028)	36,466,482
Balance, shares at Jun. 30, 2021	22,407	5,610,121	74,428,865
Issuance of common stock			$ 54	106,648			106,702
Issuance of common stock, shares			54,146
Share-based compensation			$ 53	2,597,012			2,597,065
Share-based compensation, shares			53,454
Components of net loss						(4,618,559)	(4,618,559)
Employee stock purchase plan			$ 3	27,036			27,039
Employee stock purchase plan, shares			2,952
Preferred stock conversion	$ 5,587		$ 40	(5,627)			(5,587)
Preferred stock conversion, shares	(20)		39,781
Ending balance, value at Sep. 30, 2021	$ 5,583,768	$ 5,610	$ 74,579	$ 530,019,539	$ (205,999)	$ (495,320,587)	$ 34,573,142
Balance, shares at Sep. 30, 2021	22,387	5,610,121	74,579,198