Condensed Statements of Changes in Stockholders' Deficit - 9 months ended Sep. 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	165,261	$ 42	165,219
Exercise of stock options, shares		41,815
Stock-based compensation expense	1,171,660		1,171,660
Vesting of restricted stock units	328	$ 328
Vesting of restricted stock units, shares		328,000
Stock issued under stock purchase plan	115,886	$ 66	115,820
Stock issued under stock purchase plan, shares		65,972
Issuance of common stock from the ATM Offering	$ 16,659,718	$ 4,133	16,655,585
Issuance of common stock from the ATM Offering, Shares	4,132,857	4,132,857
Retirement of treasury stock		$ (1)	(74,999)	$ 75,000
Net loss	$ (17,038,022)					(17,038,022)
Unrealized gain on short and long-term investments	1,090				$ 1,090
Balance at Sep. 30, 2017	$ (4,516,941)	$ 12,506	$ 128,114,619			$ (132,644,066)
Balance, shares at Sep. 30, 2017		12,507,215