Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,841	$ 4,344
Accumulated Amortization	(3,072)	(3,442)
Net Carrying Amount	$ 769	$ 902
Weighted-Average Remaining Useful Life	17 years 10 months 24 days	18 years 10 months 24 days
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,458	$ 2,829
Accumulated Amortization	(2,458)	(2,829)
Brands Associated with Acquired Cell Lines [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	507	583
Accumulated Amortization	(121)	(125)
Net Carrying Amount	$ 386	$ 458
Weighted-Average Remaining Useful Life	30 years 4 months 24 days	31 years 4 months 24 days
Product Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 716	$ 748
Accumulated Amortization	(333)	(304)
Net Carrying Amount	$ 383	$ 444
Weighted-Average Remaining Useful Life	5 years 4 months 24 days	5 years 10 months 24 days
Other Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 160	$ 184
Accumulated Amortization	$ (160)	$ (184)