REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 35,313	$ 28,130	$ 69,199	$ 54,767
Semi
Disaggregation of Revenue [Line Items]
Revenue	9,058	10,192	19,565	19,187
Auto/EV
Disaggregation of Revenue [Line Items]
Revenue	13,440	5,862	20,927	11,821
Defense/Aerospace
Disaggregation of Revenue [Line Items]
Revenue	3,765	3,578	9,587	6,406
Industrial
Disaggregation of Revenue [Line Items]
Revenue	4,356	3,786	7,598	6,807
Life Sciences
Disaggregation of Revenue [Line Items]
Revenue	2,002	1,386	5,574	3,074
Safety/Security
Disaggregation of Revenue [Line Items]
Revenue	770	898	1,882	1,462
Other
Disaggregation of Revenue [Line Items]
Revenue	1,922	2,428	4,066	6,010
Thermal test
Disaggregation of Revenue [Line Items]
Revenue	4,364	4,839	11,130	9,232
Thermal process
Disaggregation of Revenue [Line Items]
Revenue	4,763	5,547	10,388	10,828
Semiconductor test
Disaggregation of Revenue [Line Items]
Revenue	5,186	5,926	10,693	10,660
Video imaging
Disaggregation of Revenue [Line Items]
Revenue	2,137	2,289	4,195	4,346
Flying probe and in-circuit testers
Disaggregation of Revenue [Line Items]
Revenue	2,304	1,204	4,351	3,060
Alfamation™ products
Disaggregation of Revenue [Line Items]
Revenue	11,745	4,629	18,865	8,778
Service/other
Disaggregation of Revenue [Line Items]
Revenue	4,814	3,696	9,577	7,863
End user
Disaggregation of Revenue [Line Items]
Revenue	31,384	23,192	59,704	45,628
OEM/Integrator
Disaggregation of Revenue [Line Items]
Revenue	$ 3,929	$ 4,938	$ 9,495	$ 9,139