Goodwill, In-Process Research and Development and Intellectual Property - Summary of Gross Intellectual Property, Accumulated Amortization, and Net Intellectual Property (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 66,413	$ 66,413
Accumulated amortization	(35,725)	(30,550)
Foreign currency translation impact	3,168	3,495
Net carrying amount	33,856	39,358
Technology and Patents Purchased
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	400	400
Accumulated amortization	(93)	(72)
Foreign currency translation impact	27	30
Net carrying amount	334	358
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	66,813	66,813
Accumulated amortization	(35,818)	(30,622)
Foreign currency translation impact	3,195	3,525
Net carrying amount	$ 34,190	$ 39,716