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

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

v3.21.2
Revenues - Summary of Cumulative Adjustment Made to Balance Sheet due to Changes in Accounting for Incremental Costs of Obtaining Contracts with Customers (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets            
Contract assets $ 2,313 $ 3,796        
Total current assets 210,375 18,237     $ 65,863  
Total assets 323,672 119,915     163,364  
Liabilities and stockholders' deficit            
Contract liabilities - current 14,453 14,537   $ 8,200 7,952  
Total current liabilities 27,394 55,443     100,300  
Contract liabilities - long-term 683 2,559        
Total liabilities 170,875 152,728     181,659  
Accumulated deficit (476,304) (223,984)     (203,799)  
Total stockholders' equity/(deficit) 152,797 (32,813) $ (22,712)   (18,295) $ 7,527
Total liabilities and stockholders' equity $ 323,672 119,915     163,364  
Adjusted [Member]            
Assets            
Contract assets       337    
Total current assets       66,200    
Contract assets - long-term       281    
Total assets       163,982    
Liabilities and stockholders' deficit            
Contract liabilities - current       8,166    
Total current liabilities       100,514    
Contract liabilities - long-term       1,054    
Total liabilities       182,927    
Accumulated deficit       (204,449)    
Total stockholders' equity/(deficit)       (190,266) (18,945)  
Total liabilities and stockholders' equity       $ 163,982    
ASC 606 [Member]            
Assets            
Contract assets         337  
Total current assets         337  
Contract assets - long-term         281  
Total assets         618  
Liabilities and stockholders' deficit            
Contract liabilities - current         214  
Total current liabilities         214  
Contract liabilities - long-term         1,054  
Total liabilities         1,268  
Accumulated deficit         (650)  
Total stockholders' equity/(deficit)         (650)  
Total liabilities and stockholders' equity         $ 618  
ASC 605 [Member]            
Assets            
Contract assets   3,515        
Liabilities and stockholders' deficit            
Contract liabilities - current   14,030        
Contract liabilities - long-term   2,559        
Accumulated deficit   $ (223,196)