XML 48 R37.htm IDEA: XBRL DOCUMENT v3.21.1
Stock-Based Awards - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2016
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Aggregate of unrecognized stock-based compensation cost     $ 54,137
Weighted average recognition period     2 years 6 months
Restricted Stock Units [Member] | Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   50.00%  
Vesting period   3 years  
Restricted Stock Units [Member] | Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   50.00%  
Vesting period   4 years  
Executive Officers [Member] | Relative Total Stockholder Return Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares range percentage     0.00%
Executive Officers [Member] | Relative Total Stockholder Return Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares range percentage     150.00%