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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
€ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounting Policies [Abstract]              
Accumulated deficit $ (178,098,000)   $ (178,098,000)     $ (161,766,000)  
Escrow             $ 1,250,000
Restricted cash 1,368,000   1,368,000   € 100 $ 1,374,000  
Impairment charges, indefinite-lived 0 $ 0 0 $ 0      
Impairment charges, finite-lived 0 0 0 0      
Acquisition installment payable 489,000 816,000 1,701,000 1,702,000      
Fair value adjustment of contingent consideration $ (1,430,000) $ 909,000 $ 3,710,000 $ 1,819,000