Condensed Statements of Changes in Stockholders' Deficit - 6 months ended Jun. 30, 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	109,786	$ 41	109,745
Exercise of stock options, shares		40,809
Stock-based compensation expense	814,429		814,429
Vesting of restricted stock units	154	$ 154
Vesting of restricted stock units, shares		154,000
Employee stock purchase plan	100,912	$ 40	100,872
Employee stock purchase plan, shares		39,972
Issuance of common stock from the ATM Offering	$ 14,675,770	$ 3,185	14,672,585
Issuance of common stock from the ATM Offering, Shares	3,184,972	3,184,972
Retirement of treasury stock		$ (1)	(74,999)	$ 75,000
Net loss	$ (11,657,176)					(11,657,176)
Unrealized gain on short and long-term investments	1,090				$ 1,090
Balance at Jun. 30, 2017	$ (1,547,897)	$ 11,357	$ 125,703,966			$ (127,263,220)
Balance, shares at Jun. 30, 2017		11,358,324