REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 26,637	$ 29,824
Semi
Disaggregation of Revenue [Line Items]
Revenue	8,995	14,967
Auto/EV
Disaggregation of Revenue [Line Items]
Revenue	5,959	3,958
Defense/Aerospace
Disaggregation of Revenue [Line Items]
Revenue	2,828	3,239
Industrial
Disaggregation of Revenue [Line Items]
Revenue	3,021	4,187
Life Sciences
Disaggregation of Revenue [Line Items]
Revenue	1,688	653
Safety/Security
Disaggregation of Revenue [Line Items]
Revenue	564	541
Other
Disaggregation of Revenue [Line Items]
Revenue	3,582	2,279
Thermal test
Disaggregation of Revenue [Line Items]
Revenue	4,393	3,699
Thermal process
Disaggregation of Revenue [Line Items]
Revenue	5,281	10,955
Semiconductor test
Disaggregation of Revenue [Line Items]
Revenue	4,734	6,282
Video imaging
Disaggregation of Revenue [Line Items]
Revenue	2,057	2,119
Flying probe and in-circuit testers
Disaggregation of Revenue [Line Items]
Revenue	1,856	2,744
Alfamation
Disaggregation of Revenue [Line Items]
Revenue	4,149	1,379
Service/other
Disaggregation of Revenue [Line Items]
Revenue	4,167	2,646
End user
Disaggregation of Revenue [Line Items]
Revenue	22,436	21,430
OEM/Integrator
Disaggregation of Revenue [Line Items]
Revenue	$ 4,201	$ 8,394