REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Number of reportable segment | segment	1
Revenues	$ 101,677	$ 92,382
United States
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	56,642	56,369
Europe
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	37,162	33,133
Asia-Pacific
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	7,873	2,880
Vehicle
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	34,451	28,055
Industrial
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	31,303	33,351
Medical
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	23,289	14,551
Aerospace & Defense
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	7,442	11,142
Other
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions
Revenues	$ 5,192	$ 5,283