Condensed Statements of Stockholders' Equity (Unaudited) - 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	393,775		393,775
Issuance of common stock, net	544,643	$ 27	544,616
Issuance of common stock, shares net		268,870
Reclassification of warrant liability due to warrant amendment	3,267,885		3,267,885
Net loss	(1,982,786)			(1,982,786)
Ending Balance at Mar. 31, 2018	4,389,266	$ 1,568	77,409,139	(73,021,441)
Ending Balance, Shares at Mar. 31, 2018		15,682,480
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
Net loss	(5,805,448)
Ending Balance at Sep. 30, 2018	5,407,749	$ 1,743	82,250,109	(76,844,103)
Ending Balance, Shares at Sep. 30, 2018		17,427,533
Beginning Balance at Mar. 31, 2018	4,389,266	$ 1,568	77,409,139	(73,021,441)
Beginning Balance, Shares at Mar. 31, 2018		15,682,480
Stock-based compensation expense	387,429		387,429
Issuance of common stock, net	2,886,877	$ 122	2,886,755
Issuance of common stock, shares net		1,216,184
Net loss	(2,303,194)			(2,303,194)
Ending Balance at Jun. 30, 2018	5,360,378	$ 1,690	80,683,323	(75,324,635)
Ending Balance, Shares at Jun. 30, 2018		16,898,664
Stock-based compensation expense	380,062		380,062
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
Issuance of common stock, net	1,139,720	$ 50	1,139,670
Issuance of common stock, shares net		500,000
Net loss	(1,519,468)			(1,519,468)
Ending Balance at Sep. 30, 2018	5,407,749	$ 1,743	82,250,109	(76,844,103)
Ending Balance, Shares at Sep. 30, 2018		17,427,533
Beginning Balance at Dec. 31, 2018	$ 4,025,320	$ 1,743	82,628,312	(78,604,735)
Beginning Balance, Shares at Dec. 31, 2018	17,427,533	17,427,533
Stock-based compensation expense	$ 378,959		378,959
Issuance of common stock, net	636,432	$ 45	636,387
Issuance of common stock, shares net		450,000
Net loss	(1,965,266)			(1,965,266)
Ending Balance at Mar. 31, 2019	3,075,445	$ 1,788	83,643,658	(80,570,001)
Ending Balance, Shares at Mar. 31, 2019		17,877,533
Beginning Balance at Dec. 31, 2018	$ 4,025,320	$ 1,743	82,628,312	(78,604,735)
Beginning Balance, Shares at Dec. 31, 2018	17,427,533	17,427,533
Net loss	$ (5,707,427)
Ending Balance at Sep. 30, 2019	$ 5,173,197	$ 2,423	89,482,936	(84,312,162)
Ending Balance, Shares at Sep. 30, 2019	24,231,914	24,231,914
Beginning Balance at Mar. 31, 2019	$ 3,075,445	$ 1,788	83,643,658	(80,570,001)
Beginning Balance, Shares at Mar. 31, 2019		17,877,533
Stock-based compensation expense	344,841		344,841
Issuance of common stock, net	5,039,956	$ 623	5,039,333
Issuance of common stock, shares net		6,236,423
Net loss	(2,114,096)			(2,114,096)
Ending Balance at Jun. 30, 2019	6,346,146	$ 2,411	89,027,832	(82,684,097)
Ending Balance, Shares at Jun. 30, 2019		24,113,956
Stock-based compensation expense	331,303		331,303
Issuance of common stock, net	123,813	$ 12	123,801
Issuance of common stock, shares net		117,958
Net loss	(1,628,065)			(1,628,065)
Ending Balance at Sep. 30, 2019	$ 5,173,197	$ 2,423	$ 89,482,936	$ (84,312,162)
Ending Balance, Shares at Sep. 30, 2019	24,231,914	24,231,914