Goodwill In-Process Research and Development and Other Assets - Additional Information (Detail)	1 Months Ended		9 Months Ended
	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Goodwill			$ 33,260,000	$ 35,808,000
Accumulated impairment loss, goodwill			0
In-process research and development			15,516,000	16,705,000
Aggregate carrying amount of other investments			40,800,000	12,600,000
Other additional Investments in private medical device company			$ 28,100,000
Manufacturing Rights and Knowledge
Goodwill [Line Items]
Milestone payment		$ 1,800,000
Manufacturing Technology License Related to Introducer Sheaths
Goodwill [Line Items]
Payments to third party	$ 600,000
Other Intangible Assets
Goodwill [Line Items]
Intangible asset, amortized useful life			15 years
ECP Entwicklungsgesellschaft mbH
Goodwill [Line Items]
In-process research and development			$ 15,500,000	$ 16,700,000
ECP Entwicklungsgesellschaft mbH | Discount Rate
Goodwill [Line Items]
Fair value measurement inputs			21