Statements of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2017	$ 2,165,749	$ 1,541	$ 73,202,863	$ (71,038,655)
Beginning Balance, Shares at Dec. 31, 2017		15,413,610
Stock-based compensation expense	1,539,469		1,539,469
Issuance of common stock from employee stock purchase plan	$ 47,057	$ 3	47,054
Issuance of common stock from employee stock purchase plan, Shares	28,869	28,869
Issuance of common stock, net	$ 4,571,240	$ 199	4,571,041
Issuance of common stock, shares net		1,985,054
Reclassification of warrant liability due to warrant amendment	3,267,885		3,267,885
Net loss	(7,566,080)			(7,566,080)
Ending Balance at Dec. 31, 2018	$ 4,025,320	$ 1,743	82,628,312	(78,604,735)
Ending Balance, Shares at Dec. 31, 2018	17,427,533	17,427,533
Stock-based compensation expense	$ 1,373,958		1,373,958
Issuance of common stock from employee stock purchase plan, Shares	0
Issuance of common stock, net	$ 6,106,922	$ 700	6,106,222
Issuance of common stock, shares net		7,004,381
Net loss	(7,125,655)			(7,125,655)
Ending Balance at Dec. 31, 2019	$ 4,380,545	$ 2,443	$ 90,108,492	$ (85,730,390)
Ending Balance, Shares at Dec. 31, 2019	24,431,914	24,431,914