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

Property and Equipment - net - Additional Information (Detail)

v3.21.2
Property and Equipment - net - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 15, 2021
Satellites
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]                
Depreciation expenses             $ 8,500 $ 5,500
Impairment of long lived assets   $ 0 $ 18,400 $ 0 $ 18,407 $ 0 0 6,606
Property, Plant, and Equipment, Collections, Not Capitalized               $ 6,600
Property, Plant and Equipment, Useful Life               1 year 6 months
Property, Plant and Equipment, Net   21,703     21,703   $ 20,852 $ 10,968
Property, Plant and Equipment, Disposals         800      
Gain (Loss) on Disposition of Property Plant Equipment         24      
Continuing Operations [Member]                
Property, Plant and Equipment [Line Items]                
Depreciation expenses   $ 3,200   $ 2,400 $ 8,800 $ 5,400    
Satellites [Member]                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment, Useful Life             3 years  
NumberOfPropertyPlantAndEquipment | Satellites 2              
Satellite Procurement Work In Progress [Member]                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment, Net             $ 8,400