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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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