Revenue (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Schedule of Sales by End Market

The following tables represent a disaggregation of revenue from contracts with customers for the periods presented (in thousands):

Sales by End Market

	Year Ended December 31,
	2023		2022		2021
Industrial	$	71,044	$	91,098	$	94,795
Microfabrication	47,483		62,769		70,412
Aerospace and Defense	91,394		88,191		104,939
	$	209,921	$	242,058	$	270,146

Schedule of Sales by Geography

Sales by Geography

	Year Ended December 31,
	2023		2022		2021
North America	$	129,311	$	137,454	$	143,232
China	11,890		21,287		55,446
Rest of World	68,720		83,317		71,468
	$	209,921	$	242,058	$	270,146

Schedule of Sales by Timing of Revenue

Sales by Timing of Revenue

	Year Ended December 31,
	2023		2022		2021
Point in time	$	155,258	$	183,005	$	198,838
Over time	54,663		59,053		71,308
	$	209,921	$	242,058	$	270,146

Schedule of Contract Assets and Liabilities

Our contract assets and liabilities were as follows (in thousands):

	Balance Sheet Classification	As of December 31,
		2023		2022		$ Change		% Change
Contract assets	Prepaid expenses and other current assets	$	7,298	$	10,377	$	(3,079)	(30)	%
Contract liabilities	Deferred revenues and other long-term liabilities	6,368		2,455		3,913		159	%