Goodwill, In-Process Research and Development and Intellectual Property - Summary of Gross Intellectual Property, Accumulated Amortization, and Net Intellectual Property (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 48,500	$ 48,500
Accumulated Amortization	(13,584)	(8,458)
Foreign currency translation impact	1,350	(2,952)
Net Carrying Amount	36,266	37,090
Technology and Patents Purchased [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	400
Accumulated Amortization	(18)
Foreign currency translation impact	15
Net Carrying Amount	397
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	48,900	48,500
Accumulated Amortization	(13,602)	(8,458)
Foreign currency translation impact	1,365	(2,952)
Net Carrying Amount	$ 36,663	$ 37,090