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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details)

v3.21.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - Fair Value, Recurring - Warrants Liability - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning of the period $ 499 $ 413 $ 389
Change in fair value 3,191 86 24
End of the period $ 3,690 $ 499 $ 413