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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 26,236	$ 30,272	$ 81,003	$ 94,087
Semi
Disaggregation of Revenue [Line Items]
Revenue	9,842	11,410	29,029	36,501
Auto/EV
Disaggregation of Revenue [Line Items]
Revenue	4,964	6,250	16,785	20,943
Defense/Aerospace
Disaggregation of Revenue [Line Items]
Revenue	2,313	3,239	8,719	10,160
Industrial
Disaggregation of Revenue [Line Items]
Revenue	3,658	3,534	10,465	11,136
Life Sciences
Disaggregation of Revenue [Line Items]
Revenue	1,930	1,322	5,004	4,169
Safety/Security
Disaggregation of Revenue [Line Items]
Revenue	927	666	2,389	1,999
Other
Disaggregation of Revenue [Line Items]
Revenue	2,602	3,851	8,612	9,179
Thermal test
Disaggregation of Revenue [Line Items]
Revenue	4,818	4,602	14,050	12,529
Thermal process
Disaggregation of Revenue [Line Items]
Revenue	5,038	6,362	15,866	27,160
Semiconductor test
Disaggregation of Revenue [Line Items]
Revenue	5,167	7,169	15,827	17,465
Video imaging
Disaggregation of Revenue [Line Items]
Revenue	1,898	1,906	6,244	5,710
Flying probe and in-circuit testers
Disaggregation of Revenue [Line Items]
Revenue	1,484	1,100	4,544	4,875
Alfamation
Disaggregation of Revenue [Line Items]
Revenue	3,385	4,173	12,163	15,271
Service/other
Disaggregation of Revenue [Line Items]
Revenue	4,446	4,960	12,309	11,077
End user
Disaggregation of Revenue [Line Items]
Revenue	21,644	25,787	67,272	74,713
OEM/Integrator
Disaggregation of Revenue [Line Items]
Revenue	$ 4,592	$ 4,485	$ 13,731	$ 19,374

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