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OTHER INCOME - Summary of Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
OTHER (EXPENSE) INCOME
COVID Relief	$ 2,628		$ 5,319
Unrealized and realized (loss) gain on investments (note 6)		$ 3,220	(619)	$ 4,972
Foreign currency (loss) gain	(132)	1,616	1,736	1,242
Other income, net				69
Other expense, net	(406)	(63)	(365)
Total other (expense) income	$ 2,090	$ 4,773	$ 6,071	$ 6,283

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