Description of Business and Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of computation of basic and diluted net income (loss) per share

The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share data):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
			2012				2012
	2013		(Restated)		2013		(Restated)
Numerator
Net income (loss)	$	3,405	$	31	$	3,127	$	(921	)
Denominator
Weighted-average common shares outstanding	28,858		28,672		28,842		28,397
Effect of potentially dilutive securities:
Options to purchase common stock	—		85		12		—
Restricted stock awards	2		5		5		—
Restricted stock unit awards	—		—		—		—
Employee stock purchase plan	—		18		—		—
Weighted-average common shares outstanding, assuming dilution	28,860		28,780		28,859		28,397
Net income per share
Basic	$	0.12	$	—	$	0.11	$	(0.03	)
Diluted	$	0.12	$	—	$	0.11	$	(0.03	)

Schedule of instruments convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be anti-dilutive

	Three Months Ended				Six Months Ended
	June 30,				June 30,
			2012				2012
	2013		(Restated)		2013		(Restated)
Numerator
Net income (loss)	$	3,405	$	31	$	3,127	$	(921	)
Denominator
Weighted-average common shares outstanding	28,858		28,672		28,842		28,397
Effect of potentially dilutive securities:
Options to purchase common stock	—		85		12		—
Restricted stock awards	2		5		5		—
Restricted stock unit awards	—		—		—		—
Employee stock purchase plan	—		18		—		—
Weighted-average common shares outstanding, assuming dilution	28,860		28,780		28,859		28,397
Net income per share
Basic	$	0.12	$	—	$	0.11	$	(0.03	)
Diluted	$	0.12	$	—	$	0.11	$	(0.03	)

The following table summarizes instruments that may be convertible into common shares that are not included in the denominator used in the diluted net income per share calculation because to do so would be anti-dilutive (in thousands):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2013	2012	2013	2012
Outstanding options to purchase common stock	895	637	807	1,031
Restricted stock awards	428	340	426	429
Restricted stock unit awards	57	21	57	20
Employee stock purchase plan awards	—	—	—	—