Registration statement for securities of certain foreign private issuers

Accounting policies - Additional Information (Detail)

v3.21.2
Accounting policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Statement [Line Items]      
Development costs $ 43,027 $ 36,036  
Restricted cash $ 0 $ 0 $ 300
Bottom of range      
Statement [Line Items]      
Tax rate effect from change in tax rate 12.00%    
Top of range      
Statement [Line Items]      
Tax rate effect from change in tax rate 13.00%    
Weighted average      
Statement [Line Items]      
Tax rate effect from change in tax rate 10.30%