SIGNIFICANT ACCOUNTING POLICIES - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Item Effected [Line Items]
Depreciation									$ 1,100	$ 900
Royalty Revenue, Adjustment	$ 600	$ 300	$ (20)	$ (100)	$ (200)	$ (100)	$ 200	$ 100
Canada Emergency Wage Subsidy, Subsidy Received During Period									$ 500
Fixed fee license revenue | Minimum
Item Effected [Line Items]
Revenue, payment term									30 days
Fixed fee license revenue | Maximum
Item Effected [Line Items]
Revenue, payment term									45 days
Per-unit royalty revenue | Minimum
Item Effected [Line Items]
Revenue, payment term									30 days
Per-unit royalty revenue | Maximum
Item Effected [Line Items]
Revenue, payment term									60 days