Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Goodwill and Change in Balance (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance		$ 80,131,000	$ 80,131,000	$ 71,368,000
Additions				9,638,000
Foreign currency translation impact			(1,162,000)	(875,000)
Impairment	$ (79,000,000.0)	$ (79,000,000.0)	(78,969,000)	0
Ending balance			$ 0	$ 80,131,000