Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Company's IPR&D Assets and Change in Balance (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 15,920
Foreign currency translation impact	51	$ (2,952)
Ending balance	17,276	15,920
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	15,920
Foreign currency translation impact	1,356
Ending balance	$ 17,276	$ 15,920