Quarterly report pursuant to Section 13 or 15(d)

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

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Fair Value, Recurring - Warrants Liability - Level 3 - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning of the period $ 15,462 $ 499 $ 499
Additions 0 0 18,427
Change in fair value (2,471) 1,349 1,616
Conversion of Legacy Innovid Warrants on the Closing of the Transaction 0 0 (5,080)
End of the period $ 12,991 $ 1,848 $ 15,462