Statements of Changes in Stockholders' Equity (Deficit) - USD ($)	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2015	$ 16,893,398	$ 6,844	$ 106,569,405	$ (75,000)	$ (41,357)	$ (89,566,494)
Balance, shares at Dec. 31, 2015		6,844,242
Stock issued for payment of 2015 annual bonus	364,910	$ 133	364,777
Stock issued for payment of 2015 annual bonus, shares		133,179
Exercise of stock options	23,851	$ 11	23,840
Exercise of stock options, shares		11,093
Stock-based compensation expense	903,547		903,547
Vesting of restricted stock units	37	$ 37
Vesting of restricted stock units, shares		36,762
Stock issued under stock purchase plan	273,218	$ 80	273,138
Stock issued under stock purchase plan, shares		79,962
Stock issued for private investment	1,825,000	$ 833	1,824,167
Stock issued for private investment, shares		833,333
Growth Term Loan B warrant discount	122,460		122,460
Net loss	(26,039,550)					(26,039,550)
Other comprehensive income	40,267				40,267
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	112,138	$ 42	112,096
Exercise of stock options, shares		41,815
Stock-based compensation expense	1,376,633		1,376,633
Vesting of restricted stock units	336	$ 336
Vesting of restricted stock units, shares		336,333
Stock issued under stock purchase plan	$ 325,667	$ 141	325,526
Stock issued under stock purchase plan, shares	61,141	141,082
Issuance of common stock from the ATM Offering	$ 19,677,478	$ 5,472	19,672,006
Issuance of common stock from the ATM Offering, Shares	5,471,962	5,471,962
Retirement of treasury stock			(75,000)	$ 75,000
Net loss	$ (18,960,017)					(18,960,017)
Other comprehensive income	1,090				$ 1,090
Balance at Dec. 31, 2017	$ (3,059,537)	$ 13,929	$ 131,492,595			$ (134,566,061)
Balance, shares at Dec. 31, 2017		13,929,763