REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Number of reportable segment | segment			1
Revenues	$ 103,509	$ 94,653	$ 306,723	$ 273,696
United States
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	64,326	56,185	182,673	159,862
Europe
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	30,943	31,800	99,643	93,944
Asia-Pacific
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	8,240	6,668	24,407	19,890
Vehicle
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	33,931	32,378	102,113	79,017
Industrial
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	35,269	25,307	100,351	86,882
Medical
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	21,030	23,448	64,554	62,260
Aerospace & Defense
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	8,291	8,844	24,313	30,503
Other
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	$ 4,988	$ 4,676	$ 15,392	$ 15,034