Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

	Year Ended December 31,
	2017	2016	2015
Stock options	1,560,453	991,895	796,356
Restricted stock units	509,894	490,954	874,508
Common stock warrants	389,423	411,514	411,514
	2,459,770	1,894,363	2,082,378