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Other Balance Sheet Components - Accounts Receivable (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts receivable, net:      
Total gross amount $ 122,583,000 $ 121,605,000  
Allowance for doubtful accounts:      
Balance at the beginning of the year (1,375,000) (2,440,000) $ (3,242,000)
Reversal (additional provision) charged to expenses, net (7,787,000) 368,000 (2,138,000)
Write-off 2,633,000 697,000 2,940,000
Balance at the end of the year (6,529,000) (1,375,000) $ (2,440,000)
Accounts receivable, net 116,054,000 120,230,000  
Alibaba      
Accounts receivable, net:      
Total gross amount 24,293,000 54,052,000  
Allowance for doubtful accounts:      
Balance at the beginning of the year 0    
Balance at the end of the year 0 0  
Accounts receivable, net 24,293,000 54,052,000  
Other related parties      
Accounts receivable, net:      
Total gross amount 31,589,000 33,961,000  
Allowance for doubtful accounts:      
Balance at the beginning of the year 0    
Balance at the end of the year (1,483,000) 0  
Accounts receivable, net 30,106,000 33,961,000  
Third parties      
Accounts receivable, net:      
Total gross amount 66,701,000 33,592,000  
Allowance for doubtful accounts:      
Balance at the beginning of the year (1,375,000)    
Balance at the end of the year (5,046,000) (1,375,000)  
Accounts receivable, net $ 61,655,000 $ 32,217,000