NET LOSS PER COMMON SHARE

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

NET LOSS PER COMMON SHARE

NET LOSS PER COMMON SHARE

Basic earnings per common share is calculated using the weighted‑average number of common shares outstanding during the period less the weighted‑average shares subject to repurchase. Diluted earnings per common share, if any, gives effect to dilutive common stock subject to repurchase, stock options (calculated based on the treasury stock method), shares purchased under the employee stock purchase plan and convertible debt (calculated using an as-if-converted method).

For the three months ended March 31, 2014 and 2013, diluted net loss per common share is identical to basic net loss per common share due to potentially dilutive securities being excluded from the calculation, as their effect is anti-dilutive. Potentially dilutive securities excluded from diluted net loss per common share on an actual outstanding basis, were as follows (in thousands):

	March 31, 2014
	2014	2013
Employee stock options	5,068	5,994
Employee stock purchase plan	173	—
Restricted stock and restricted stock units	4,419	3,861
Convertible notes	17,857	17,878
Total	27,517	27,733