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Concentration of Risks - Additional Information (Details) - Customer Concentration Risk
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Total revenue        
Concentration Risk [Line Items]        
Concentration risk percentage   0.00%    
Revenue, Product and Service Benchmark [Member]        
Concentration Risk [Line Items]        
Concentration risk percentage   0.00% 0.00%  
Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Concentration risk percentage   0.00%   0.00%
Lam Research Corporation | Total revenue        
Concentration Risk [Line Items]        
Concentration risk percentage 16.00%   16.00%