Patents and Other Intangible Assets - Schedule of Patents and Other Intangibles Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 93,779	$ 49,430
Accumulated amortization	(41,882)	(38,969)
Patents and other intangible assets, net	$ 51,897	10,461
Weighted Average Amortization Period	9 years
IPR&D [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 26,800
Weighted Average Amortization Period	Indefinite
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 39,085	38,621
Accumulated amortization	$ (35,016)	(34,151)
Weighted Average Amortization Period	10 years
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 12,400
Accumulated amortization	$ (827)
Weighted Average Amortization Period	10 years
Licenses and Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 14,654	10,276
Accumulated amortization	$ (5,744)	(4,625)
Weighted Average Amortization Period	7 years
Trademarks-Finite Lived [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 840	533
Accumulated amortization	$ (295)	$ (193)
Weighted Average Amortization Period	9 years