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
Beginning Balance, shares at Dec. 31, 2019	23,110	5,610,121	68,529,623
Issuance of common stock			$ 3,815	15,004,554			15,008,369
Issuance of common stock, Shares			3,815,092
Share-based compensation			$ 117	1,657,604			1,657,721
Share-based compensation, Shares			116,989
Components of net loss						(3,892,637)	(3,892,637)
Employee stock purchase plan			$ 18	65,006			65,024
Employee stock purchase plan, Shares			17,835
Preferred stock conversion	$ (76,049)		$ 551	75,498			76,049
Preferred stock conversion, Shares	(297)		551,285
Ending balance, value at Jun. 30, 2020	$ 5,682,141	$ 5,610	$ 73,031	521,013,702	(205,999)	(485,205,411)	35,680,933
Ending Balance, shares at Jun. 30, 2020	22,813	5,610,121	73,030,824
Beginning balance, value at Mar. 31, 2020	$ 5,709,027	$ 5,610	$ 69,041	504,990,377	(205,999)	(483,284,305)	21,574,724
Beginning Balance, shares at Mar. 31, 2020	22,918	5,610,121	69,040,781
Issuance of common stock			$ 3,774	15,028,445			15,032,219
Issuance of common stock, Shares			3,774,276
Share-based compensation			$ 8	935,401			935,409
Share-based compensation, Shares			7,500
Components of net loss						(1,921,106)	(1,921,106)
Employee stock purchase plan			$ 11	32,790			32,801
Employee stock purchase plan, Shares			11,429
Preferred stock conversion	$ (26,886)		$ 197	26,689			26,886
Preferred stock conversion, Shares	(105)		196,838
Ending balance, value at Jun. 30, 2020	$ 5,682,141	$ 5,610	$ 73,031	521,013,702	(205,999)	(485,205,411)	35,680,933
Ending Balance, shares at Jun. 30, 2020	22,813	5,610,121	73,030,824
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
Beginning Balance, shares at Dec. 31, 2020	22,513	5,610,121	73,694,203
Issuance of common stock			$ 246	339,440			339,686
Issuance of common stock, Shares			244,584
Share-based compensation			$ 272	4,156,002			4,156,274
Share-based compensation, Shares			272,500
Components of net loss						(2,742,795)	(2,742,795)
Employee stock purchase plan			$ 11	62,246			62,257
Employee stock purchase plan, Shares			11,207
Preferred stock conversion	$ (27,142)		$ 206	26,936			27,142
Preferred stock conversion, Shares	(106)		206,371
Ending balance, value at Jun. 30, 2021	$ 5,578,181	$ 5,610	$ 74,429	527,294,470	(205,999)	(490,702,028)	36,466,482
Ending Balance, shares at Jun. 30, 2021	22,407	5,610,121	74,428,865
Beginning balance, value at Mar. 31, 2021	$ 5,578,437	$ 5,610	$ 74,090	524,388,783	(205,999)	(489,491,630)	34,770,854
Beginning Balance, shares at Mar. 31, 2021	22,408	5,610,121	74,089,659
Issuance of common stock			$ 90	86,761			86,851
Issuance of common stock, Shares			89,778
Share-based compensation			$ 242	2,785,475			2,785,717
Share-based compensation, Shares			242,250
Components of net loss						(1,210,398)	(1,210,398)
Employee stock purchase plan			$ 5	33,197			33,202
Employee stock purchase plan, Shares			5,204
Preferred stock conversion	$ (256)		$ 2	254			256
Preferred stock conversion, Shares	(1)		1,974
Ending balance, value at Jun. 30, 2021	$ 5,578,181	$ 5,610	$ 74,429	$ 527,294,470	$ (205,999)	$ (490,702,028)	$ 36,466,482
Ending Balance, shares at Jun. 30, 2021	22,407	5,610,121	74,428,865