Goodwill, In-Process Research and Development and Intellectual Property - Summary of Gross Intellectual Property, Accumulated Amortization, and Net Intellectual Property (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2009
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 5,000	$ 5,000
Accumulated Amortization		(3,438)
Write-off		(1,562)
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 66,413	48,500
Accumulated Amortization	(19,724)	(8,458)
Foreign currency translation impact	5,529	(2,952)
Net Carrying Amount	52,218	37,090
Technology and Patents Purchased [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	400
Accumulated Amortization	(30)
Foreign currency translation impact	50
Net Carrying Amount	420
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	66,813	53,500
Accumulated Amortization	(19,754)	(11,896)
Foreign currency translation impact	5,579	(2,952)
Write-off		(1,562)
Net Carrying Amount	$ 52,638	$ 37,090