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

COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS - Property (Details)

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COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS - Property (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Property, Plant and Equipment, Net, by Type [Abstract]      
Gross property, plant and equipment $ 700 $ 381  
Less: Accumulated depreciation and amortization (344) (172)  
Property, plant and equipment, net 356 209 $ 109
Depreciation expense 172 172  
Medical Equipment      
Property, Plant and Equipment, Net, by Type [Abstract]      
Gross property, plant and equipment 588 278  
Computer equipment      
Property, Plant and Equipment, Net, by Type [Abstract]      
Gross property, plant and equipment 43 38  
Furniture and fixtures      
Property, Plant and Equipment, Net, by Type [Abstract]      
Gross property, plant and equipment $ 69 $ 65