Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Company's IPR&D Assets and Change in Balance (Detail) - In-Process Research and Development [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 10,747
Foreign currency translation impact	(220)
Ending balance	$ 10,527