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

Property, Plant and Equipment (Details)

v3.21.2
Property, Plant and Equipment (Details) - 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
Dec. 31, 2018
Property, Plant and Equipment [Line Items]              
Less: Accumulated Depreciation and Amortization $ (23,700)   $ (23,700)   $ (15,243) $ (8,495)  
Total property, plant and equipment, net 16,693   16,693   18,107 13,438  
Depreciation expense 2,900 $ 1,600 8,500 $ 4,700 6,700 4,700 $ 3,000
Capital lease assets 12,300   12,300   10,700 9,000  
Capital lease assets, accumulated depreciation 9,400   9,400   7,600 5,200  
Computers and Peripheral Equipment              
Property, Plant and Equipment [Line Items]              
Property, plant and equipment gross 16,738   16,738   14,577 12,666  
Office Furniture and Equipment              
Property, Plant and Equipment [Line Items]              
Property, plant and equipment gross 1,104   1,104   1,124 387  
Leasehold Improvements              
Property, Plant and Equipment [Line Items]              
Property, plant and equipment gross 9,315   9,315   9,267 5,736  
Capitalized software development costs              
Property, Plant and Equipment [Line Items]              
Property, plant and equipment gross $ 13,236   $ 13,236   $ 8,382 $ 3,144