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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Income Taxes [Line Items]          
Valuation allowance increase (decrease) $ 9,200 $ 100 $ 10,000 $ 8,500  
Impact of unrecognized tax benefits on effective tax rate   $ 2,900      
Corporate tax rate   21.00% 35.00% 34.00%  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 12,800      
Tax cuts and jobs Act, increased tax provision on undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation   (1,338) $ 3,266    
Impact on assets and liabilities due to change in accounting principle   (677)      
Undistributed earnings of foreign subsidiaries   72,400      
Foreign earnings subject to one time transition tax   $ 58,000      
Accounting Standards Update 2016-06 [Member] | Other Assets [Member]          
Income Taxes [Line Items]          
Impact on assets and liabilities due to change in accounting principle         $ 5,700
Accounting Standards Update 2016-06 [Member] | Deferred tax liablities [Member]          
Income Taxes [Line Items]          
Impact on assets and liabilities due to change in accounting principle         5,000
Accounting Standards Update 2016-06 [Member] | accumulated deficit [Member]          
Income Taxes [Line Items]          
Impact on assets and liabilities due to change in accounting principle         $ 700
Latest Tax Year          
Income Taxes [Line Items]          
Net operating loss and business tax credit carry forwards expiration date   At various dates through December 2037      
TangenX Technology Corporation          
Income Taxes [Line Items]          
Valuation allowance increase (decrease) $ 5,900        
Domestic Tax Authority          
Income Taxes [Line Items]          
Net operating loss carry forwards   $ 19,500      
State          
Income Taxes [Line Items]          
Business tax credits carry forwards   2,900      
Federal and State          
Income Taxes [Line Items]          
Increase in net operating loss carryovers     $ 5,100    
United States          
Income Taxes [Line Items]          
Business tax credits carry forwards   $ 400