NET LOSS PER COMMON SHARE

6 Months Ended

Jun. 30, 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 and six months ended June 30, 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):

	Three Months Ended June 30,		Six Months Ended June 30,
	2014	2013	2014	2013
Employee stock options	4,540	5,646	4,540	5,646
Employee stock purchase plan	89	14	45	14
Restricted stock and restricted stock units	4,336	3,887	4,336	3,887
Convertible notes	17,857	17,857	17,857	17,868
Total	26,822	27,404	26,778	27,415