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Revenue - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 168,016	$ 161,662
United States
Disaggregation of Revenue [Line Items]
Revenue	122,112	114,804
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	17,653	18,800
Europe
Disaggregation of Revenue [Line Items]
Revenue	25,030	26,320
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	3,221	1,738
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	98,665	94,223
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	18,602	20,070
Industrials
Disaggregation of Revenue [Line Items]
Revenue	15,913	15,037
Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	7,970	7,229
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	12,373	13,812
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	5,761	5,442
Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	5,282	3,123
Other
Disaggregation of Revenue [Line Items]
Revenue	3,450	2,726
Operating segments | North America
Disaggregation of Revenue [Line Items]
Revenue	136,932	132,946
Operating segments | North America | United States
Disaggregation of Revenue [Line Items]
Revenue	120,600	113,935
Operating segments | North America | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	14,270	18,052
Operating segments | North America | Europe
Disaggregation of Revenue [Line Items]
Revenue	1,412	744
Operating segments | North America | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	650	215
Operating segments | North America | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	89,773	86,613
Operating segments | North America | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	13,611	15,022
Operating segments | North America | Industrials
Disaggregation of Revenue [Line Items]
Revenue	9,302	9,007
Operating segments | North America | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	4,987	3,822
Operating segments | North America | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	9,109	10,293
Operating segments | North America | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	2,483	2,506
Operating segments | North America | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	5,137	3,045
Operating segments | North America | Other
Disaggregation of Revenue [Line Items]
Revenue	2,530	2,638
Operating segments | International
Disaggregation of Revenue [Line Items]
Revenue	29,407	28,138
Operating segments | International | United States
Disaggregation of Revenue [Line Items]
Revenue	309	173
Operating segments | International | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	3,489	1,341
Operating segments | International | Europe
Disaggregation of Revenue [Line Items]
Revenue	24,183	25,920
Operating segments | International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,426	704
Operating segments | International | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	8,855	7,572
Operating segments | International | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	4,980	4,940
Operating segments | International | Industrials
Disaggregation of Revenue [Line Items]
Revenue	6,053	5,528
Operating segments | International | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,657	2,562
Operating segments | International | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	3,237	3,518
Operating segments | International | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	2,136	2,039
Operating segments | International | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	145	78
Operating segments | International | Other
Disaggregation of Revenue [Line Items]
Revenue	2,344	1,901
Operating segments | Products & Systems
Disaggregation of Revenue [Line Items]
Revenue	3,739	2,936
Operating segments | Products & Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	1,801	1,351
Operating segments | Products & Systems | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	326	16
Operating segments | Products & Systems | Europe
Disaggregation of Revenue [Line Items]
Revenue	261	580
Operating segments | Products & Systems | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,351	989
Operating segments | Products & Systems | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	37	38
Operating segments | Products & Systems | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	11	108
Operating segments | Products & Systems | Industrials
Disaggregation of Revenue [Line Items]
Revenue	558	502
Operating segments | Products & Systems | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,326	845
Operating segments | Products & Systems | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	27	1
Operating segments | Products & Systems | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	1,142	897
Operating segments | Products & Systems | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating segments | Products & Systems | Other
Disaggregation of Revenue [Line Items]
Revenue	638	545
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue	(2,062)	(2,358)
Corp/Elim | United States
Disaggregation of Revenue [Line Items]
Revenue	(598)	(655)
Corp/Elim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	(432)	(609)
Corp/Elim | Europe
Disaggregation of Revenue [Line Items]
Revenue	(826)	(924)
Corp/Elim | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	(206)	(170)
Corp/Elim | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Industrials
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corp/Elim | Other
Disaggregation of Revenue [Line Items]
Revenue	$ (2,062)	$ (2,358)

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