Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

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

v3.21.1
Share-Based Compensation - Summary of Share-Based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based Payment Arrangement, Expense $ 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 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 338 374 285
General and Administrative [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based Payment Arrangement, Expense $ 209 $ 102 $ 90