Condensed Statements of Changes in Stockholders' Deficit - 3 months ended Mar. 31, 2017 - USD ($)	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2016	$ (5,592,862)	$ 7,938	$ 110,081,334	$ (75,000)	$ (1,090)	$ (115,606,044)
Balance, shares at Dec. 31, 2016		7,938,571
Exercise of stock options	35,023	$ 13	35,010
Exercise of stock options, shares		13,116
Stock-based compensation expense	396,537		396,537
Vesting of restricted stock units	109	$ 109
Vesting of restricted stock units, shares		109,000
Employee stock purchase plan	14,888		14,888
Retirement of treasury stock		$ (1)	(74,999)	$ 75,000
Net loss	(5,816,274)					(5,816,274)
Unrealized gain on investments	354				354
Balance at Mar. 31, 2017	$ (10,962,225)	$ 8,059	$ 110,452,770		$ (736)	$ (121,422,318)
Balance, shares at Mar. 31, 2017		8,060,687