Stock Plans (Tables)

6 Months Ended

Jun. 30, 2012

Stock Plans [Abstract]

Schedule Of Share-Based Compensation Expense

	Three months ended June 30,				Six months ended June 30,
	2012		2011		2012		2011
Cost of revenues	$	102	$	72	$	187	$	118
Sales and marketing		419		282		710		435
General and administrative		1,740		1,169		3,148		2,006
Research and development		172		136		305		227
Total share-based compensation expense	$	2,433	$	1,659	$	4,350	$	2,786

Schedule Of Assumptions Used In Determining The Fair Value Of Service-Based Stock Option Awards

	Six months ended June 30, 2012			Year ended December 31, 2011
Expected volatility		63.31-63.96	%		62.85-64.42	%
Expected dividends		—			—
Expected term (in years)		3.00 - 6.25			3.00 - 6.25
Risk-free rate		0.44-1.49	%		0.71-2.88	%

Summary Of Activity Of Stock Options Under All Plans

	Outstanding Options
		Shares		Wtd. Avg. Exercise Price		Wtd. Avg. remaining contractual life in years			Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2011			2,865,390	$	15.73
Granted			443,996	$	28.80
Exercised			(197,320)	$	14.99			$	2,905
Forfeited or expired			(390,875)	$	34.75
Outstanding at June 30, 2012			2,721,191	$	15.19		6.37	$	37,957
Exercisable at June 30, 2012			1,092,820	$	14.26		4.32	$	16,297

Summary Of Unvested Stock Options

Unvested Shares	Shares		Wtd. Avg. Grant Date Fair Value
Unvested at December 31, 2011		1,657,618	$	6.68
Granted		443,996		16.78
Vested		(454,368)		8.08
Forfeited or expired		(18,875)		12.34
Unvested at June 30, 2012		1,628,371	$	8.97

Summary Of Activity Of Restricted Stock Awards And Restricted Stock Units

	Restricted Stock Units		Restricted Stock Awards		Wtd. Avg. Grant Date Fair Value
Outstanding/unvested balance at December 31, 2011		189,650		7,104	$	22.11
Awarded		127,750		6,036	$	28.84
Released/vested		(50,206)		(7,104)	$	21.67
Forfeited/cancelled		(150)		—	$	31.25
Outstanding/unvested balance at June 30, 2012		267,044		6,036	$	25.50