ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Components of accumulated other comprehensive loss:
Balance at the beginning of the period	$ 32,387	$ 32,864
Other comprehensive loss (income) before reclassifications	142	10,219
Net current-period other comprehensive loss (income)	142	10,219
Balance at the end of the period	32,529	43,083
Currency Translation Losses
Components of accumulated other comprehensive loss:
Balance at the beginning of the period	32,581	32,775
Other comprehensive loss (income) before reclassifications	338	10,586
Net current-period other comprehensive loss (income)	338	10,586
Balance at the end of the period	32,919	43,361
Unrealized (Gains) Losses on Available-for-Sale Securities
Components of accumulated other comprehensive loss:
Balance at the beginning of the period	(194)	89
Other comprehensive loss (income) before reclassifications	(196)	(367)
Net current-period other comprehensive loss (income)	(196)	(367)
Balance at the end of the period	$ (390)	$ (278)