Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Earnings Per Share

Diluted net income per share attributed to common shares is computed by dividing the net income attributable to common shares for the period by the weighted average number of common and potential common shares outstanding during the period, if the effect of each class of potential common shares is dilutive. Potential common shares include restricted stock units and incremental shares of common stock issuable upon the exercise of stock options.

	Year ended December 31,
	2012		2011		2010
Net income per share:	(in thousands, except per share amounts)
Numerator
Net income	$	22,998	$	14,048	$	17,127
Denominator
Denominator for basic net income per share
Weighted-average common shares outstanding	35,826		32,788		27,025
Dilutive effect of stock options and restricted awards	1,606		2,219		2,224
Denominator for diluted net income per share	37,432		35,007		29,249
Net income per share
Basic	$	0.64	$	0.43	$	0.63
Diluted	$	0.61	$	0.40	$	0.59

Excluded from computation of diluted net loss as anti-dilutive

The following weighted-average outstanding stock options and restricted stock units were excluded from the computation of diluted net income per common share for the periods presented because including them would have had an anti-dilutive effect (in thousands):

	Year ended December 31,
	2012	2011	2010
Stock options and restricted stock units	748	278	830

Schedule of reportable information by product or service type

Net revenues by Consumer and Enterprise categories were as follows:

	Year ended December 31,
	2012		2011		2010
	(in thousands)
Net revenues
Consumer	$	613,445	$	459,725	$	302,599
Enterprise	27,179		13,545		5,108
Total net revenues	$	640,624	$	473,270	$	307,707