SIGNIFICANT ACCOUNTING POLICIES - Computation and Reconciliation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss) as reported
Net (loss) income attributable to DMC Global Inc. stockholders, as reported		$ (202)	$ (1,412)	$ 34,041
Adjustment of redeemable noncontrolling interest	$ 808	(4,424)	0	0
Less: Distributed net income available to participating securities		0	0	(85)
Less: Undistributed net income available to participating securities		0	0	(582)
Numerator for basic net (loss) income per share:		(4,626)	(1,412)	33,374
Add: Undistributed net income allocated to participating securities		0	0	582
Less: Undistributed net income reallocated to participating securities		0	0	(579)
Numerator for diluted net (loss) income per share:		$ (4,626)	$ (1,412)	$ 33,377
Denominator:
Weighted average shares outstanding for basic net (loss) income per share (in shares)		17,610,711	14,790,296	14,579,608
Effect of dilutive securities (in shares)		0	0	75,742
Weighted average shares outstanding for diluted net (loss) income per share (in shares)		17,610,711	14,790,296	14,655,350
Net (loss) income per share attributable to DMC Global Inc. stockholders:
Basic (in dollars per share)		$ (0.26)	$ (0.10)	$ 2.29
Diluted (in dollars per share)		$ (0.26)	$ (0.10)	$ 2.28