Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,344	$ 4,419
Accumulated Amortization	(3,442)	(3,469)
Net Carrying Amount	$ 902	$ 950
Weighted-Average Remaining Useful Life	18 years 10 months 24 days	19 years 9 months 18 days
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,829	$ 2,923
Accumulated Amortization	(2,829)	(2,923)
Brands Associated with Acquired Cell Lines [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	583	603
Accumulated Amortization	(125)	(115)
Net Carrying Amount	$ 458	$ 488
Weighted-Average Remaining Useful Life	31 years 4 months 24 days	32 years 4 months 24 days
Product Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 748	$ 703
Accumulated Amortization	(304)	(241)
Net Carrying Amount	$ 444	$ 462
Weighted-Average Remaining Useful Life	5 years 10 months 24 days	6 years 7 months 6 days
Other Intangibles Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 184	$ 190
Accumulated Amortization	$ (184)	$ (190)