COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (5,757)	$ (10,060)	$ (7,344)	$ (3,737)
Other comprehensive income (loss) before reclassifications	48	(1,775)	1,676	(8,139)
Amounts reclassified from accumulated other comprehensive loss	(21)	18	(62)	59
Net-current period other comprehensive income (loss)	27	(1,757)	1,614	(8,080)
Ending balance	(5,730)	(11,817)	(5,730)	(11,817)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,295)	(6,506)	(5,323)	(1,165)
Other comprehensive income (loss) before reclassifications	455	(731)	2,483	(6,072)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net-current period other comprehensive income (loss)	455	(731)	2,483	(6,072)
Ending balance	(2,840)	(7,237)	(2,840)	(7,237)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	821	(633)	862	(674)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	(21)	18	(62)	59
Net-current period other comprehensive income (loss)	(21)	18	(62)	59
Ending balance	800	(615)	800	(615)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,283)	(2,921)	(2,883)	(1,898)
Other comprehensive income (loss) before reclassifications	(407)	(1,044)	(807)	(2,067)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net-current period other comprehensive income (loss)	(407)	(1,044)	(807)	(2,067)
Ending balance	$ (3,690)	$ (3,965)	$ (3,690)	$ (3,965)