Other Assets - Schedule of Other Assets Consist Principally of Strategic Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Schedule of Investments [Line Items]
Other assets, net	$ 1,979	$ 1,979
CeloNova BioSciences, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	1,500	1,500
ViaCyte, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	$ 479	$ 479