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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 25, 2021
Jan. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Noncontrolling Interest [Line Items]        
Issue of redeemable noncontrolling interests   $ 1,500 $ 1,514  
Investments, Approved by Government $ 49,000      
Beijing Tongmei Xtal Technology        
Noncontrolling Interest [Line Items]        
Issue of redeemable noncontrolling interests   $ 1,500   $ 48,100
Redeemable non controlling interests ownership percentage       7.06%
Investments, Approved by Government $ 49,000      
Percentage of Equity Issued on Conversion of Non Controlling Interests 7.28%   14.50%