EARNINGS PER SHARE - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss	$ (5,357)	$ (212)
Net loss attributable to non-controlling interest	(2,223)	(93)
Net loss attributable to Digital Media Solutions, Inc. - basic and diluted	$ (3,134)	$ (119)
Denominator:
Weighted-average shares outstanding - diluted (in shares)	35,576,000	33,241,000
Net earnings (loss) per common share:
Basic (usd per share)	$ (0.09)	$ 0
Diluted (usd per share)	$ (0.09)	$ 0