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

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Depreciable Assets (Detail)

v3.21.2
Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Depreciable Assets (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 7 months  
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 5 months  
Inservice Ground Stations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 4 months  
Computer Software and Website Development [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 months  
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 months  
Capitalized Satellite Launch Costs and In service Satellites [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years 3 years
Capitalized Satellite Launch Costs and In service Satellites [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 2 years 2 years