Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stock-Based Compensation [Abstract]

Stock-Based Compensation Expenses Included In The Condensed Consolidated Statements Of Operations

	For the Year Ended
	December 31,
	2012		2011		2010
Sales and marketing	$	1,169	$	779	$	873
Research and development		212		424		257
General and administrative		2,516		1,905		1,094
	$	3,897	$	3,108	$	2,224

Schedule Of Valuation Assumptions Used For Stock Options And ESPP Plans

	2012		2011		2010
Risk-free interest rate:
Time-based stock options	0.92	%	2.34	%	2.39	%
Performance-based stock options	0.96		1.96		2.43
ESPP	0.09		0.06		0.15
Volatility factor of the market price of our common stock:
Time-based stock options	63.79	%	65.16	%	72.50	%
Performance-based stock options	63.66		65.14		72.66
ESPP	56.79		50.67		68.92
Weighted-average expected life (years):
Time-based stock options	5.21		5.28		5.03
Performance-based stock options	5.22		5.28		5.02
ESPP	0.25		0.25		0.25
Dividend yield	0.00	%	0.00	%	0.00	%

Schedule Of Stock Option Activity

	Options Outstanding
				Weighted-
		Weighted-		Average
	Number	Average		Remaining	Aggregate
	of	Exercise Price		Contractual	Intrinsic
	Shares	Per Share		Term (Years)	Value
Balance at December 31, 2009	7,939	$	2.93	6.34	$	3,181
Options forfeited	(1,223)		5.35
Options granted	1,475		3.46
Options exercised	(730)		1.87
Balance at December 31, 2010	7,461	$	2.74	6.22	$	12,034
Options forfeited	(762)		3.84
Options granted	2,504		5.06
Options exercised	(2,288)		2.71
Balance at December 31, 2011	6,915	$	3.46	6.98	$	8,130
Options forfeited	(1,536)		5.13
Options granted	1,889		6.14
Options exercised	(1,270)		2.66
Balance at December 31, 2012	5,998	$	4.05	6.06	$	5,575
Vested and expected to vest after
December 31, 2012	5,673	$	3.96	5.92	$	5,552
Exercisable at December 31, 2012	3,648	$	3.25	4.66	$	5,055

Schedule Of RSU Activity

	Restricted Stock Units Outstanding
	Number	Aggregate
	of	Intrinsic
	Shares	Value
Balance at December 31, 2010	—
Awarded	192
Vested/Released	—
Forfeited	(15)
Balance at December 31, 2011	177	$	758
Awarded	190
Vested/Released	(47)
Forfeited	(60)
Balance at December 31, 2012	260	$	1,121
Vested and expected to vest after
December 31, 2012	223	$	961
Ending Exercisable at December 31, 2012
(Vested and deferred)	—		—