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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty Reserve (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Standard assurance warranty period 1 year 1 year
Internationally warranty period 13 months  
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty reserve, at the beginning of the year $ 1,553 $ 1,491
Warranty reserve, at the end of the period   $ 1,553