Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets
Depreciation and amortization		$ 789
Stock compensation expense	5,312	6,945
Tax credits		6,035
Other	3,280	1,958
Total deferred tax assets	13,346	22,899
Valuation allowance	(287)	(249)
Deferred tax assets, net	8,089	19,813
Deferred Tax Liabilities
Depreciation and amortization	(1,905)
Intangible assets	(1,085)	(1,627)
Capitalized software development costs	(1,980)	(1,210)
Deferred tax assets, net	8,089	19,813
US Country [Member]
Deferred tax assets
U.S net operating loss carryforwards	4,589	6,935
Foreign Country [Member]
Deferred tax assets
Foreign net operating loss carryforwards	$ 165	$ 237