Goodwill, In-Process Research and Development and Intangible Assets - Carrying Value of Company's IPR&D Assets and Change in Balance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 16,511
Foreign currency translation impact	(2,952)	$ (1,671)
Ending balance	15,920	16,511
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	16,511
Additions		17,100
Foreign currency translation impact	(591)	(589)
Ending balance	$ 15,920	$ 16,511