Related Parties - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Nov. 30, 2018	Sep. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Cirius Therapeutics, Inc., [Member]
Related Party Transaction [Line Items]
Amount of transactions with related party for providing services			$ 281,000
Revenue recognized from related parties agreement			120,000	$ 161,000
Viscient Biosciences [Member]
Related Party Transaction [Line Items]
Revenue recognized from related parties agreement				358,000
Viscient Biosciences [Member] | Study Materials [Member]
Related Party Transaction [Line Items]
Amount of transactions with related party for providing services		$ 2,000
Revenue recognized from related parties agreement			2,000
Viscient Biosciences [Member] | Research Services [Member]
Related Party Transaction [Line Items]
Amount of transactions with related party for providing services	$ 142,000
Revenue recognized from related parties agreement			42,000
Viscient Biosciences [Member] | Samsara [Member] | Primary Human Cell-based Products [Member]
Related Party Transaction [Line Items]
Amount of transactions with related party for providing services			165,000
Revenue recognized from related parties agreement			$ 96,000	$ 14,000