Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule of Outstanding Shares of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share Attributable to Common Stockholders

The following outstanding shares of common stock equivalents were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:

	As of June 30,
	2015		2014
Options to purchase common stock		3,294,849		966,778
Common stock subject to repurchase		116,674		—
Convertible preferred stock		252,817		252,818
Redeemable convertible preferred stock		17,328,059		17,236,784
Warrants for preferred stock		885,201		984,529
Total potential dilutive shares		21,877,600		19,440,909