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Income Taxes - (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
subsidiary
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Current [Abstract]      
State $ 2 $ 2 $ 13
Foreign 529 213 175
Total current 531 215 188
Total net provision for income taxes $ 531 $ 215 $ 188
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%
State income taxes, net of federal tax benefits (as a percent)   (0.20%) (0.10%)
Change in valuation allowance (as a percent) (209.40%) (695.80%) (111.80%)
Stock-based compensation (as a percent) (6.50%) (26.30%) (1.40%)
Foreign rate differences (as a percent) 213.80% 758.60% 85.30%
Dividend from PRC investee (as a percent) (57.80%) (169.80%) (19.60%)
Net loss from privately-held PRC investments (as a percent) 1.10% 45.60% 2.50%
Other (as a percent) (0.10%) 14.40% 7.30%
Effective tax rate (as a percent) (23.90%) (38.50%) (2.80%)
Deferred tax assets [Abstract]      
Net operating loss $ 60,538 $ 55,654  
Accruals and reserves not yet deductible 3,723 4,517  
Credits 1,488 1,488  
Deferred tax assets, gross 65,749 61,659  
Net deferred tax assets 65,749 61,659  
Valuation allowance (65,749) (61,659)  
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Gross unrecognized tax benefits balance at December 31, 2013 16,403    
Decrease related to lapse of statute of limitations (1,846)    
Gross unrecognized tax benefits balance at December 31, 2014 14,557 16,403  
(Increase) and decrease in valuation allowance 4,100 3,700  
Non-U.S. income included in income (loss) before tax $ 15,200 $ 12,800 $ 16,700
Change in cumulative ownership percentage (as a percent) 50.00%    
Period with in which cumulative ownership change 3 years    
Unrecognized tax benefits interest and penalties $ 0    
Unrecognized tax benefits accrued interest and penalties 0    
Unrecognized tax liabilities of undistributed earnings of foreign subsidiaries 80,500    
Unrecognized tax benefit would favorably impact the effective tax rate in future periods if recognized 14,600    
Majority-Owned Subsidiaries [Member]      
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Restricted cash and investments 22,300    
Cash and investments not available for use 15,900    
Wholly Owned China Subsidiary      
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Restricted cash and investments 16,800    
Three Partially Owned Consolidated China Subsidiaries      
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Restricted cash and investments $ 5,500    
Number of partially owned subsidiaries | subsidiary 3    
Domestic Tax Authority      
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Operating loss carryforwards $ 179,800    
Tax credit carryforwards 1,500    
State      
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward]      
Operating loss carryforwards $ 1,700