Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2015	$ 9,879	$ 114,950,278	$ (98,633,745)	$ 16,326,412
Balance, shares at Dec. 31, 2015	9,878,906
Stock-based compensation expense (employees and directors)		935,899		935,899
Issuance of common stock, net of costs	$ 1,200	1,776,750		1,777,950
Issuance of common stock, net of costs, shares	1,200,000
Purchase and retirement of common stock	$ (979)	(1,095,629)		(1,096,608)
Purchase and retirement of common stock, shares	(979,114)
Exercise of stock options	$ 345	389,534		389,879
Exercise of stock options, shares	345,127
Exercise of warrants	$ 153	336,447		336,600
Exercise of warrants, shares	153,000
Vesting of restricted stock	$ 121	(121)
Vesting of restricted stock, shares	120,634
Net loss			(5,734,681)	(5,734,681)
Balance at Dec. 31, 2016	$ 10,719	117,293,158	(104,368,426)	12,935,451
Balance, shares at Dec. 31, 2016	10,718,553
Cumulative adjustment upon modified retrospective adoption of ASU 2016-09 at Dec. 31, 2017		33,894	(33,894)
Balance after adoption of recent accounting pronouncement at Dec. 31, 2016	10,719	117,327,052	(104,402,320)	12,935,451
Balance after adoption of recent accounting pronouncement, shares at Dec. 31, 2016	10,718,553
Stock-based compensation expense (employees and directors)		435,679		435,679
Issuance of common stock, net of costs	$ 4,169	8,508,692		8,512,861
Issuance of common stock, net of costs, shares	4,168,750
Purchase and retirement of common stock				(1,096,608)
Exercise of stock options	$ 10	10,090		10,100
Exercise of stock options, shares	10,000
Exercise of warrants	$ 63	139,637		139,700
Exercise of warrants, shares	63,500
Vesting of restricted stock	$ 50	(50)
Vesting of restricted stock, shares	50,207
Shares forfeited in exchange for payment of withholding taxes	$ (2)	(4,231)		(4,233)
Shares forfeited in exchange for payment of withholding taxes, shares	(1,764)
Net loss			(6,020,505)	(6,020,505)
Balance at Dec. 31, 2017	$ 15,009	$ 126,416,869	$ (110,422,825)	$ 16,009,053
Balance, shares at Dec. 31, 2017	15,009,246