REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 28,130	$ 33,991	$ 54,767	$ 63,815
Semi
Disaggregation of Revenue [Line Items]
Revenue	10,192	10,124	19,187	25,091
Auto/EV
Disaggregation of Revenue [Line Items]
Revenue	5,862	10,735	11,821	14,693
Defense/Aerospace
Disaggregation of Revenue [Line Items]
Revenue	3,578	3,682	6,406	6,921
Industrial
Disaggregation of Revenue [Line Items]
Revenue	3,786	3,415	6,807	7,602
Life Sciences
Disaggregation of Revenue [Line Items]
Revenue	1,386	2,194	3,074	2,847
Safety/Security
Disaggregation of Revenue [Line Items]
Revenue	898	792	1,462	1,333
Other
Disaggregation of Revenue [Line Items]
Revenue	2,428	3,049	6,010	5,328
Thermal test
Disaggregation of Revenue [Line Items]
Revenue	4,839	4,228	9,232	7,927
Thermal process
Disaggregation of Revenue [Line Items]
Revenue	5,547	9,843	10,828	20,798
Semiconductor test
Disaggregation of Revenue [Line Items]
Revenue	5,926	4,014	10,660	10,296
Video imaging
Disaggregation of Revenue [Line Items]
Revenue	2,289	1,685	4,346	3,804
Flying probe and in-circuit testers
Disaggregation of Revenue [Line Items]
Revenue	1,204	1,031	3,060	3,775
Alfamation
Disaggregation of Revenue [Line Items]
Revenue	4,629	9,719	8,778	11,098
Service/other
Disaggregation of Revenue [Line Items]
Revenue	3,696	3,471	7,863	6,117
End user
Disaggregation of Revenue [Line Items]
Revenue	23,192	27,496	45,628	48,926
OEM/Integrator
Disaggregation of Revenue [Line Items]
Revenue	$ 4,938	$ 6,495	$ 9,139	$ 14,889