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Income Tax Expense (Income Tax Expense (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Income tax benefit at federal statutory rate $ (11,983) $ (9,797) $ (1,490)
State income tax expense (benefit) net of federal benefit 116 18 (1,458)
Meals and entertainment 210 264 182
Research and development credits 0 (342) (327)
Stock-based compensation 382 421 684
Contingent consideration 4,658 3,570 0
Foreign tax rate differential 4,736 1,025 0
Net change in valuation allowance 2,244 4,097 (13,974)
Income Tax Reconciliation, Balance Sheet True Up 168 658 1,346
Income tax expense (benefit) $ 531 $ (86) $ (15,037)