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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Shipping and Handling (Details) - USD ($)
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
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Total shipping and handling $ 6,500 $ 3,900 $ 6,500 $ 3,900 $ 3,900 $ 39,000
Total shipping and handling costs included in distribution costs $ 81,000 $ 36,000 $ 200,000 $ 140,000 $ 246,000 $ 357,000