Net Loss Per Share

6 Months Ended

Jun. 30, 2015

13. Net Loss per Share

Basic and diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding for the period, excluding shares subject to repurchase, and without consideration of potentially dilutive securities. The Company's potential dilutive shares, which include outstanding common stock options, unvested common shares subject to repurchase, convertible preferred stock and warrants, and convertible long-term notes, have not been included in the computation of diluted net loss per share for all periods as the result would be anti-dilutive. Such potentially dilutive shares are excluded when the effect would be to reduce the net loss per share.

Potentially dilutive shares that were not included in the diluted per share calculations because they would be anti‑dilutive as of the three and six months ended June 30, 2015 and 2014 were as follows:


	June 30,
	2015	2014
	(in thousands)
Options to purchase common stock	9,402	6,660
Warrants	840	435
Common stock subject to repurchase	1,499	1,857
Convertible preferred stock	31,397	27,048
	43,138	36,000