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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Non-U.S. income included in income (loss) before tax $ 6,500,000 $ 6,400,000 $ 15,000,000
Current:      
State 5,000 2,000 4,000
Foreign 933,000 790,000 729,000
Total current 938,000 792,000 733,000
Total provision for income taxes $ 938,000 $ 792,000 $ 733,000
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate [Abstract]      
Statutory federal income tax rate (as a percent) 21.00% 35.00% 35.00%
Valuation allowance (as a percent) (2.60%) (139.50%) (7.10%)
Rate change (as a percent)   100.80%  
Stock-based compensation (as a percent) 0.30% (10.40%) 1.20%
Foreign tax rate differential (as a percent) (11.40%) (10.30%) (12.20%)
Foreign income tax incentive (as a percent) (2.90%) (7.00%) (13.60%)
Dividend from unconsolidated affiliates (as a percent)     1.50%
Foreign tax incentives (as a percent) 2.60% 55.60%  
Section 78 gross up   11.70%  
Foreign tax credit (as a percent)   (30.60%)  
Tax effect in equity method loss or gain from unconsolidated affiliates (as a percent) 3.20% 2.90% 8.30%
Foreign-derived intangible income (as apercent) (2.40%)    
Others (as a percent) 0.10% (0.90%) (0.20%)
Effective tax rate (as a percent) 7.90% 7.30% 12.90%
Deferred tax assets:      
Net operating loss $ 15,735,000 $ 14,203,000  
Accruals and reserves not yet deductible 2,100,000 3,133,000  
Credits 1,685,000 4,809,000  
Deferred tax assets, gross 19,520,000 22,145,000  
Net deferred tax assets 19,520,000 22,145,000  
Valuation allowance (19,520,000) (22,145,000)  
Increase (decrease) in valuation allowance $ (2,600,000) (46,300,000) $ 2,700,000
Realized benefits of tax rate reduction (as a percent) 10.00%    
Tax reform, foreign tax credit $ 3,100,000    
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Gross unrecognized tax benefits beginning balance 14,557,000 14,557,000 14,557,000
Gross unrecognized tax benefits ending balance 14,557,000 14,557,000 14,557,000
Unrecognized tax benefit would favorably impact the effective tax rate in future periods if recognized 14,600,000    
Domestic Tax Authority      
Deferred tax assets:      
Operating loss carryforwards 64,300,000    
Tax credit carryforwards 1,700,000    
State      
Deferred tax assets:      
Operating loss carryforwards $ 300,000    
Foreign Tax Authority      
Deferred tax assets:      
EIT income tax rate (as a percent) 25.00%    
Preferential tax rate (as a percent) 15.00%    
Benefit from foreign tax rate $ 764,000 $ 599,000 $ 489,000