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Stock-Based Compensation Expense - Stock Based Compensation Expense Recognized in Accompanying Condensed Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock compensation expense $ 1,935 $ 1,128
RSUs and Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock compensation expense 1,826 1,066
Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock compensation expense $ 109 $ 62