Post-effective amendment to a registration statement that is not immediately effective upon filing

Share-Based Compensation - Summary of Share-Based Payment Arrangement, Expensed and Capitalized, Amount (Detail)

v3.21.2
Share-Based Compensation - Summary of Share-Based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Share-based Payment Arrangement, Expense $ 49,887 $ 652 $ 51,662 $ 1,585 $ 3,196 $ 2,171 $ 1,377
Research and Development [Member]              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Share-based Payment Arrangement, Expense 17,608 524 18,858 1,339 2,649 1,695 1,002
Selling and Marketing [Member]              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Share-based Payment Arrangement, Expense 14,306 73 14,584 140 338 374 285
General and Administrative [Member]              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Share-based Payment Arrangement, Expense $ 17,973 $ 55 $ 18,220 $ 106 $ 209 $ 102 $ 90