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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details)

v3.21.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Level 1      
Assets:      
Money market funds $ 11,013 $ 9,009 $ 11,001
Liabilities:      
Warrants liability 0 0 0
Level 2      
Assets:      
Money market funds 0 0 0
Liabilities:      
Warrants liability 0 0 0
Level 3      
Assets:      
Money market funds 0 0 0
Liabilities:      
Warrants liability $ 3,690 $ 499 $ 413