REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Number of reportable segment | segment			1
Revenues	$ 101,537	$ 86,661	$ 203,214	$ 179,043
United States
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	61,705	47,311	118,347	103,680
Europe
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	31,538	29,012	68,700	62,145
Asia-Pacific
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	8,294	10,338	16,167	13,218
Vehicle
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	33,731	18,584	68,182	46,639
Industrial
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	33,778	28,223	65,081	61,574
Medical
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	20,235	24,261	43,524	38,812
Aerospace & Defense
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	8,579	10,516	16,021	21,658
Other
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	$ 5,214	$ 5,077	$ 10,406	$ 10,360