Goodwill and In-Process Research and Development - Additional Information (Detail)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Goodwill	$ 33,948,000	$ 35,808,000
Accumulated impairment loss, goodwill	0
In-process research and development	15,837,000	16,705,000
ECP Entwicklungsgesellschaft mbH
Goodwill [Line Items]
In-process research and development	$ 15,800,000	$ 16,700,000
ECP Entwicklungsgesellschaft mbH \| Discount Rate
Goodwill [Line Items]
Fair value measurement inputs	21

Value of input used to measure alternative investment.

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