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Leases - Schedule Includes Other Information About Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating cash flows from operating leases $ 122 $ 308 $ 376 $ 935
Operating cash flows from finance leases   1 1 3
Finance cash flows from finance leases $ 227 $ 12 $ 537 $ 51
Weighted average remaining lease term:        
Operating leases 6 years 6 months   6 years 6 months  
Finance leases 10 months 24 days   10 months 24 days  
Weighted average discount rate:        
Operating leases 8.43%   8.43%  
Finance leases 6.25%   6.25%