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Subsequent Events (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 25, 2021
USD ($)
Feb. 28, 2021
USD ($)
Jan. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Events            
Issue of redeemable noncontrolling interests         $ 48,102  
Investments, equity method       $ 6,376 $ 6,376 $ 5,961
Subsequent Event            
Subsequent Events            
Issue of redeemable noncontrolling interests $ 1,500          
Investments, government approved $ 49,000          
Subsequent Event | ChaoYang XinMei            
Subsequent Events            
Investment value, agreement amount   $ 3,000        
Investments, equity method   $ 1,800        
Ownership (as a percent)   58.50%        
Initial funding   $ 1,500        
Beijing Tongmei Xtal Technology            
Subsequent Events            
Issue of redeemable noncontrolling interests       $ 48,100    
Beijing Tongmei Xtal Technology | Subsequent Event            
Subsequent Events            
Private equity ownership percentage 7.28%          
Additional percentage of ownership, consolidated method     0.55      
Purchase of subsidiary shares from noncontrolling interest     $ 3,730      
Percentage of ownership, consolidated method (in hundredths)     85.50%      
Beijing Tongmei Xtal Technology | Subsequent Event | ChaoYang XinMei            
Subsequent Events            
Investment amount   $ 900