TRADE AND OTHER RECEIVABLES - Schedule of accounts, notes, loans and financing receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Current	$ 12,362	$ 12,500
Overdue	1,074	1,211
Total accounts receivable	13,436	13,711
Less: expected credit losses	(588)	(588)
Net accounts receivable	12,848	13,123
Sales tax receivable	302	242
Government subsidies receivable	2,254	1,743
Income tax receivable	3,845	3,845
Accounts and other receivables, net, current	$ 19,249	$ 18,953