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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | $ (5,044) | $ (8,169) | $ (7,344) | $ (3,737)
Other comprehensive income (loss) before reclassifications | (692) | (1,914) | 1,628 | (6,364)
Amounts reclassified from accumulated other comprehensive loss | (21) | 23 | (41) | 41
Net-current period other comprehensive income (loss) | (713) | (1,891) | 1,587 | (6,323)
Ending balance | (5,757) | (10,060) | (5,757) | (10,060)
Unrealized Gains and Losses on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | (3,151) | (5,346) | (5,323) | (1,165)
Other comprehensive income (loss) before reclassifications | (144) | (1,160) | 2,028 | (5,341)
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0 | 0
Net-current period other comprehensive income (loss) | (144) | (1,160) | 2,028 | (5,341)
Ending balance | (3,295) | (6,506) | (3,295) | (6,506)
Defined Benefit Pension Items |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | 842 | (656) | 862 | (674)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | (21) | 23 | (41) | 41
Net-current period other comprehensive income (loss) | (21) | 23 | (41) | 41
Ending balance | 821 | (633) | 821 | (633)
Foreign Currency Items |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | (2,735) | (2,167) | (2,883) | (1,898)
Other comprehensive income (loss) before reclassifications | (548) | (754) | (400) | (1,023)
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0 | 0
Net-current period other comprehensive income (loss) | (548) | (754) | (400) | (1,023)
Ending balance | $ (3,283) | $ (2,921) | $ (3,283) | $ (2,921)

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