Net Loss Per Share Available to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Net Loss Per Share

The following table presents the calculation of basic and diluted net loss per share for the periods presented (in thousands except per share amounts):

	Years Ended December 31,
	2016			2015			2014
Numerator:
Net loss available to common stockholders	$	(16,480	)	$	(33,349	)	$	(33,171	)
Denominator:
Weighted average number of shares, basic and diluted		38,318			36,580			34,210
Net loss per share available to common stockholders:
Basic and diluted net loss per common share available to common stockholders	$	(0.43	)	$	(0.91	)	$	(0.97	)

Potential Common Shares Outstanding

The following table presents the potential common shares outstanding that were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because including them would have been anti-dilutive:

	Years Ended December 31,
	2016		2015		2014
Options to purchase common stock		3,749		5,960		6,376
Restricted stock units		3,003		1,221		769
Restricted common stock		2		131		580
Common stock subject to repurchase		3		18		85
		6,757		7,330		7,810