Statements of Convertible Preferred Stock and Stockholders' Equity (Unaudited) - USD ($)	Convertible Preferred Stock Series A [Member]	Convertible Preferred Stocks Series B [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2018	$ 5,960,475		$ 59,058	$ 478,179,574	$ (205,999)	$ (476,721,490)	$ 1,311,143
Beginning Balance, Shares at Dec. 31, 2018	23,900		59,058,297
Issuance of common stock			$ 7,164	12,878,144			12,885,308
Issuance of common stock, Shares			7,163,760
Share-based compensation			$ 207	1,380,488			1,380,695
Share-based compensation, Shares			206,962
Components of net income (loss)						(3,506,790)	(3,506,790)
Employee stock purchase plan			$ 32	54,770			54,802
Employee stock purchase plan, Shares			32,064
Preferred stock issuance		$ 5,610		10,626,328			10,631,938
Preferred stock issuance, shares		5,610,121
Preferred stock conversion	$ (30,726)		$ 216	30,510			30,726
Preferred stock conversion, Shares	(120)		216,028
Ending balance, value at Sep. 30, 2019	$ 5,929,749	$ 5,610	$ 66,677	503,149,814	(205,999)	(480,228,280)	22,787,822
Ending Balance, Shares at Sep. 30, 2019	23,780	5,610,121	66,677,111
Beginning balance, value at Jun. 30, 2019	$ 5,948,953		$ 59,383	479,127,279	(205,999)	(480,272,028)	(1,291,365)
Beginning Balance, Shares at Jun. 30, 2019	23,855		59,383,038
Issuance of common stock			$ 7,117	12,928,623			12,935,740
Issuance of common stock, Shares			7,117,276
Share-based compensation			$ 33	425,680			425,713
Share-based compensation, Shares			32,500
Components of net income (loss)						43,748	43,748
Employee stock purchase plan			$ 8	22,836			22,844
Employee stock purchase plan, Shares			8,307
Preferred stock issuance		$ 5,610		10,626,328			10,631,938
Preferred stock issuance, shares		5,610,121
Preferred stock conversion	$ (19,204)		$ 136	19,068			19,204
Preferred stock conversion, Shares	(75)		135,990
Ending balance, value at Sep. 30, 2019	$ 5,929,749	$ 5,610	$ 66,677	503,149,814	(205,999)	(480,228,280)	22,787,822
Ending Balance, Shares at Sep. 30, 2019	23,780	5,610,121	66,677,111
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			$ 3,856	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 income (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
Ending 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
Beginning 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 income (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
Ending Balance, Shares at Sep. 30, 2020	22,513	5,610,121	73,678,206