Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $)	Total	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Beginning Balance, Preferred Stock at Dec. 31, 2012		$ 18,225,166
Beginning Balance at Dec. 31, 2012	(19,659,354)		124	195,525	(19,855,003)
Beginning Balance, Preferred Stock Shares at Dec. 31, 2012		12,195,068
Beginning Balance, Shares at Dec. 31, 2012			1,242,750
Stock-based compensation expense	145,966			145,966
Conversion of shares of preferred stock to common stock	18,225,166	(18,225,166)	244	18,224,922
Conversion of shares of preferred stock to common stock, Shares		(12,195,068)	2,439,002
Initial public offering of common stock	25,120,948		242	25,120,706
Initial public offering of common stock, Shares			2,415,000
Reclassification of warrant liability	187,000			187,000
Net loss	(2,836,465)				(2,836,465)
Ending Balance at Dec. 31, 2013	21,183,261		610	43,874,119	(22,691,468)
Ending Balance, Shares at Dec. 31, 2013	6,096,752		6,096,752
Stock-based compensation expense	1,102,087			1,102,087
Issuance of common stock upon exercise of warrant, Shares			2,795
Issuance of common stock upon exercise of stock option	1,522			1,522
Issuance of common stock upon exercise of stock option, Shares	5,250		5,250
Issuance of common stock from employee stock purchase plan	41,353		1	41,352
Issuance of common stock from employee stock purchase plan, Shares			7,294
Fair market value of issued warrant	108,122			108,122
Net loss	(13,247,681)				(13,247,681)
Ending Balance at Dec. 31, 2014	$ 9,188,664		$ 611	$ 45,127,202	$ (35,939,149)
Ending Balance, Shares at Dec. 31, 2014	6,112,091		6,112,091