General form of registration statement for all companies including face-amount certificate companies

Revenues - Summary of Cumulative Adjustment Made to Consolidated Income Statement due to Changes in Accounting for Incremental Costs of Obtaining Contracts with Customers (Detail)

v3.21.2
Revenues - Summary of Cumulative Adjustment Made to Consolidated Income Statement due to Changes in Accounting for Incremental Costs of Obtaining Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Revenues [Abstract]            
Revenues $ 7,937 $ 5,317 $ 22,596 $ 14,728 $ 21,135 $ 13,713
Cost of Revenue [Abstract]            
Selling, general and administrative 40,674 6,972 57,979 21,035 28,606 33,862
Operating loss (48,950) (12,536) (88,249) (32,665) (41,395) (46,248)
Service [Member]            
Revenues [Abstract]            
Revenues 1,408 (217) 4,951 1,468 18,737 13,325
Cost of Revenue [Abstract]            
Costs, excluding depreciation and amortization 5,387 4,430 8,754 9,614 13,331 11,098
Product [Member]            
Revenues [Abstract]            
Revenues 6,529 5,534 17,645 13,260 2,398 388
Cost of Revenue [Abstract]            
Costs, excluding depreciation and amortization $ 7,266 $ 3,692 $ 15,816 $ 10,132 10,535 $ 399
ASC 605 [Member]            
Cost of Revenue [Abstract]            
Selling, general and administrative         28,472  
Operating loss         (41,634)  
ASC 605 [Member] | Service [Member]            
Revenues [Abstract]            
Revenues         18,737  
Cost of Revenue [Abstract]            
Costs, excluding depreciation and amortization         13,331  
ASC 605 [Member] | Product [Member]            
Revenues [Abstract]            
Revenues         2,025  
Cost of Revenue [Abstract]            
Costs, excluding depreciation and amortization         $ 10,535