Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2018	$ 48,312,566	$ 876	$ 170,207,844	$ (116,855,991)	$ (5,040,163)
Beginning Balance (in shares) at Dec. 31, 2018		9,078,239
Stock based compensation	407,714		407,714
Vesting of restricted stock awards including withholding, net	28		28
Vesting of restricted stock awards including withholding, net (in shares)		71
Issuance of common stock in registered direct offering, net of offering costs	12,668,784	$ 436	12,668,348
Issuance of common stock in registered direct offering, net of offering costs (in shares)		4,361,370
Issuance of common stock upon exercise of warrants	30,324	$ 1	30,323
Issuance of common stock upon exercise of warrants (in shares)		11,000
Net loss	(2,097,306)			(2,097,306)
Ending Balance at Mar. 31, 2019	59,322,110	$ 1,313	183,314,257	(118,953,297)	(5,040,163)
Ending Balance (in shares) at Mar. 31, 2019		13,450,680
Beginning Balance at Dec. 31, 2019	45,520,146	$ 1,508	187,914,916	(137,376,122)	(5,020,156)
Beginning Balance (in shares) at Dec. 31, 2019		15,312,167
Stock based compensation	214,921		214,921
Vesting of restricted stock awards including withholding, net	(17,079)	$ 1	(17,080)
Vesting of restricted stock awards including withholding, net (in shares)		(5,974)
Issuance of common stock from Employee Stock Purchase Plan	56,739	$ 3	56,736
Issuance of common stock from Employee Stock Purchase Plan (in shares)		38,809
Issuance of common stock upon exercise of warrants	39,974	$ 2	39,972
Issuance of common stock upon exercise of warrants (in shares)		14,500
Unrealized loss on short-term investments	(32,435)				(32,435)
Net loss	(3,885,649)			(3,885,649)
Ending Balance at Mar. 31, 2020	$ 41,896,617	$ 1,514	$ 188,209,465	$ (141,261,771)	$ (5,052,591)
Ending Balance (in shares) at Mar. 31, 2020		15,359,502