Stockholders' Equity

3 Months Ended

Mar. 31, 2018

Stockholders Equity Note [Abstract]

Stockholders' Equity

7. Stockholders’ Equity

Common Stock Reserved for Issuance

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

	March 31, 2018		December 31, 2017
Options and awards issued and outstanding		3,793,364		2,964,549
Shares available for issuance under 2015 Stock Option and Incentive Plan		1,357,043		863,538
Shares available for issuance under 2015 Employee Stock Purchase Plan		807,571		449,444
Total		5,957,978		4,277,531