Customer Concentration (Percentage of Total Revenue From Licenses Over 10% of Revenue) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Depomed [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	55.00%	72.00%	45.00%	43.00%
Noden [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	27.00%	26.00%	36.00%	41.00%
LENSAR [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	18.00%	10.00%	19.00%	11.00%
Royalty right [Member]
Revenue, Major Customer [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			$ (62,567)
AcelRx [Member] | Royalty right [Member]
Revenue, Major Customer [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			$ (57,650)