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Goodwill and In-Process Research and Development - Additional Information (Detail) - USD ($)	1 Months Ended
	Jul. 31, 2014	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Goodwill [Line Items]
Goodwill		$ 35,808,000	$ 31,045,000	$ 33,003,000
Accumulated impairment loss, goodwill		0
In-process research and development		$ 16,705,000	$ 14,482,000	$ 15,396,000
ECP Entwicklungsgesellschaft mbH
Goodwill [Line Items]
In-process research and development	$ 18,500,000
Fair value inputs, discount rate	21.50%