COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - Ionis - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2020
Commitments And Contingencies [Line Items]
Amount awarded to other party		$ 41.2
Increase in contingent liability			$ 38.2
Subsequent Event
Commitments And Contingencies [Line Items]
Litigation settlement expense	$ 41.2