XML 80 R69.htm IDEA: XBRL DOCUMENT v3.20.4
Commitments And Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Loss Contingencies [Line Items]        
Finance lease right of use asset $ 9.2      
Finance lease incremental borrowing rate 8.40%      
Lease rental expenses $ 0.6 $ 0.3    
Future minimum sublease income receivable $ 1.1      
Workmen Compensation [Member] | Minimum [Member]        
Loss Contingencies [Line Items]        
Estimate Of Possible Loss       $ 0.4
Workmen Compensation [Member] | Maximum [Member]        
Loss Contingencies [Line Items]        
Estimate Of Possible Loss       $ 0.5
Leasehold Improvements [Member]        
Loss Contingencies [Line Items]        
Lease improvements expenditure incurred     $ 3.4