Net Loss per Share Attributable to Portola Common Stockholders

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Net Loss per Share Attributable to Portola Common Stockholders

10. Net Loss per Share Attributable to Portola Common Stockholders

Basic net loss per share attributable to Portola Common Stockholders has been computed by dividing the net loss attributable to Portola Common Stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted net loss per share attributable to Portola Common Stockholders is calculated by dividing net loss attributable to Portola Common Stockholders by the weighted average number of shares of Common Stock and potential dilutive securities outstanding during the period.

The following common stock equivalent shares were excluded from the computation of diluted net loss per share attributable to Portola Common Stockholders for the three and six months ended June 30, 2017 and 2016 because including them would have been anti-dilutive:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Stock options to purchase common stock		6,176,302		5,969,370		6,176,302		5,969,370
Performance stock options		180,752		271,122		180,752		271,122
Common stock warrants		1,500		1,500		1,500		1,500
Restricted stock units		646,653		585,989		646,653		585,989
Performance stock units		368,418		290,756		368,418		290,756
Employee stock purchase plan		22,982		25,457		22,982		25,457