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Stock-Based Compensation - Stock Based Compensation Expense Recognized in Accompanying Condensed Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock compensation expense $ 2,185 $ 2,568 $ 3,313 $ 3,672
RSUs and Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock compensation expense 2,122 2,527 3,188 3,397
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock compensation expense $ 63 $ 41 $ 125 $ 275