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Income Taxes - Additional Information (Detail)
€ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2017
USD ($)
Dec. 31, 2016
EUR (€)
Income Taxes [Line Items]              
Effective tax rate (130.90%) 27.90% (49.00%) 30.50%      
U.S. statutory tax rate 34.00% 34.00% 34.00% 34.00%      
Valuation allowance increase (decrease) $ 9,200            
Income tax (benefit) provision (4,784) $ 1,500 $ (3,785) $ 2,415      
Latest Tax Year              
Income Taxes [Line Items]              
Net operating loss and business tax credit carry forwards expiration date         At various dates through December 2036    
Domestic Tax Authority              
Income Taxes [Line Items]              
Business tax credits carry forwards         $ 1,745    
State              
Income Taxes [Line Items]              
Business tax credits carry forwards         442    
Intellectual Property              
Income Taxes [Line Items]              
Income tax (benefit) provision $ (5,625)            
ASU No. 2016-09 | U S Federal And State Jurisdiction              
Income Taxes [Line Items]              
Net operating loss carry forwards           $ 5,300  
Increase in valuation allowance           5,300  
Impact of adopting ASU 2016-09 on retained earnings           $ 0  
United States              
Income Taxes [Line Items]              
Net operating loss carry forwards         48,550    
Germany              
Income Taxes [Line Items]              
Net operating loss carry forwards         $ 2,407   € 2,287