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Income Taxes - Reconciliation to Statutory Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes      
Income tax expense (benefit) at U.S. statutory rates $ (41,806) $ (7,926) $ (27,424)
State taxes, net of U.S. federal impact (1,963) (1,607) (662)
Effect of international operations 8,849 (7,659) (6,160)
Research and development tax credit (801) (1,628) (1,935)
Net change in valuation allowance 50,520 23,655 27,156
Change in accrual for unrecognized tax benefits (1,700) 4,876 (1,940)
ALD liquidation (12,435)    
U.S. share-based compensation 2,133    
Goodwill impairment     9,786
Change in contingent consideration     (10,279)
Worthless stock deduction   (2,069)  
Change in entity tax status   904  
Other (31) 786 44
Total expense (benefit) for income taxes $ 2,766 $ 9,332 $ (11,414)