Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Schedule of reserved shares of common stock for issuance

The Company had reserved shares of common stock for issuance as follows:

	September 30, 2018	December 31, 2017
Stock options and restricted stock units issued and outstanding	6,581,890	6,061,081
Stock options and restricted stock units available for grant under stock option plans	1,552,554	1,133,907
Common stock available for the Employee Stock Purchase Plan	309,419	456,002
Total	8,443,863	7,650,990