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Income Taxes - Reconciliation to Statutory Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes      
Income tax expense (benefit) at U.S. statutory rates $ (7,926) $ (27,424) $ (24,923)
State taxes, net of U.S. federal impact (1,607) (662) (1,554)
Effect of international operations (7,659) (6,160) (4,275)
Domestic production activities deduction     1,554
Research and development tax credit (1,628) (1,935) (3,151)
Net change in valuation allowance 23,655 27,156 2,420
Change in accrual for unrecognized tax benefits 4,876 (1,940) 577
Goodwill impairment   9,786  
Change in contingent consideration   (10,279) 290
Worthless stock deduction (2,069)    
Change in entity tax status 904    
Other 786 44 115
Total expense (benefit) for income taxes 9,332 $ (11,414) $ (28,947)
Excess tax benefits $ 500