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Income Taxes - (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:        
State   $ 2,000 $ 4,000 $ 2,000
Foreign   790,000 729,000 529,000
Total current   792,000 733,000 531,000
Total net provision for income taxes   $ 792,000 $ 733,000 $ 531,000
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate [Abstract]        
Statutory federal income tax rate (as a percent)   35.00% 35.00% 35.00%
Valuation allowance (as a percent)   (139.50%) (7.10%) (48.20%)
Rate change (as a percent)   100.80%    
Stock-based compensation (as a percent)   (10.40%) 1.20% (9.80%)
Foreign tax rate differential (as a percent)   (10.30%) (12.20%) 30.60%
Foreign income tax incentive (as a percent)   (7.00%) (13.60%) 25.20%
Dividend from unconsolidated affiliates (as a percent)     1.50% (60.40%)
965(a) inclusion (as a percent)   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)   2.90% 8.30% 1.20%
Others (as a percent)   (0.90%) (0.20%) (0.10%)
Effective tax rate (as a percent)   7.30% 12.90% (26.50%)
Deferred tax assets [Abstract]        
Net operating loss   $ 14,203,000 $ 62,459,000  
Accruals and reserves not yet deductible   3,133,000 4,520,000  
Credits   4,809,000 1,488,000  
Deferred tax assets, gross   22,145,000 68,467,000  
Net deferred tax assets   22,145,000 68,467,000  
Valuation allowance   (22,145,000) (68,467,000)  
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 $ 16,403,000
Decrease related to lapse of statute of limitations       (1,846,000)
Gross unrecognized tax benefits ending balance   14,557,000 14,557,000 14,557,000
Increase (decrease) in valuation allowance   (46,300,000) 2,700,000  
Non-U.S. income included in income (loss) before tax   6,400,000 15,000,000 15,200,000
Unrecognized tax benefits interest and penalties   0    
Unrecognized tax benefits accrued interest and penalties   $ 0    
Realized benefits of tax rate reduction (as a percent)   10.00%    
One time transition tax rate impact on cash assets (as a percent)   15.50%    
One time transition tax rate impact on specific assets (as a percent)   8.00%    
Tax reform, accumulated foreign earnings tax provision   $ 20,900,000    
Tax reform, alternate minimum tax   500,000    
Net impact of tax reform   0    
Tax reform, change in net deferred tax assets   10,900,000    
Tax reform, change in valuation allowance   10,900,000    
Unrecognized tax benefit would favorably impact the effective tax rate in future periods if recognized   14,600,000    
Forecast        
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%      
Domestic Tax Authority        
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]        
Operating loss carryforwards   63,600,000    
Tax credit carryforwards   1,500,000    
State        
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]        
Operating loss carryforwards   $ 300,000    
Foreign Tax Authority        
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]        
EIT income tax rate (as a percent)   25.00%    
Preferential tax rate (as a percent)   15.00%    
Benefit from foreign tax rate   $ 599,000,000 $ 489,000,000 $ 354,000,000
Renewal Period For Favorable Tax Rate   3 years