Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Performance Stock Units - Additional Information (Detail)

v3.21.2
Stock-Based Compensation - Performance Stock Units - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Jul. 31, 2021
d
shares
Jun. 30, 2019
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock, shares granted     5,613,334
2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock, shares granted     5,710,787
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense related to performance stock units | $     $ 1.7
Unrecognized stock-based compensation expense, expected recognition weighted-average period     34 months
Performance Stock Units [Member] | 2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Increase in common stock starting price | $ / shares   $ 12.48  
Performance Stock Units [Member] | Inducement Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Consecutive trading day | d 30    
Performance Stock Units [Member] | Tranche One [Member] | 2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   50.00%  
Performance Stock Units [Member] | Tranche Two [Member] | 2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   100.00%  
Performance Stock Units [Member] | Tranche Three [Member] | 2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   120.00%  
Performance Stock Units [Member] | Mr Carr [Member] | Inducement Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock, shares granted 600,000    
Performance Stock Units [Member] | Mr. Blome [Member] | 2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Benefit from forfeiture of stock     166,667
Performance Stock Units [Member] | Three Executive Officers [Member] | 2017 Omnibus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock, shares granted   311,667