SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share Reconciliation [Abstract]
Net (loss) income attributable to DMC Global Inc. stockholders, as reported	$ (3,288)	$ 432
Less: Adjustment of redeemable noncontrolling interest	(5,717)	0
Less: Undistributed net income available to participating securities	0	(5)
Numerator for basic net (loss) income per share:	(9,005)	427
Add: Undistributed net income allocated to participating securities	0	5
Less: Undistributed net income reallocated to participating securities	0	(5)
Numerator for diluted net (loss) income per share:	$ (9,005)	$ 427
Denominator:
Weighted average shares outstanding for basic net (loss) income per share (in shares)	19,301,126	15,453,103
Effect of dilutive securities (in shares)	0	10,820
Weighted average shares outstanding for diluted net (loss) income per share (in shares)	19,301,126	15,463,923
Net (loss) income per share
Basic (in dollars per share)	$ (0.47)	$ 0.03
Diluted (in dollars per share)	$ (0.47)	$ 0.03
Anti-dilutive securities (in shares)	14,069