Common Stock Reserved for Issuance (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Schedule of Common Stock Reserved for Future Issuance

The common stock reserved for future issuance at December 31, 2015 and 2014 was as follows:

	December 31
	2015		2014
Conversion of outstanding convertible preferred stock		—		27,654,928
Shares underlying outstanding stock options		6,053,672		4,248,504
Shares available for future stock option grants		3,166,968		295,101
ESPP shares available for issuance		285,621		—
Warrant to purchase convertible preferred stock		—		128,231
Warrant to purchase common stock		326,991		—
Total shares of common stock reserved		9,833,252		32,326,764