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Income Tax Expense (Income Tax Expense (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Income tax benefit at federal statutory rate $ (5,467) $ (11,983) $ (9,797)
State income tax expenses net of federal benefit 73 116 18
Meals and entertainment 298 210 264
Research and development credits 0 0 (342)
Stock-based compensation 546 382 421
Contingent consideration 2,890 4,658 3,570
Foreign tax rate differential 656 4,736 1,025
Net change in valuation allowance 2,417 2,244 4,097
Income Tax Reconciliation, Balance Sheet True Up (1,347) 0 0
Income Tax Reconciliation, Other Adjustments (76) 168 658
Income tax expense (benefit) $ (10) $ 531 $ (86)