Fair Value Measurements - Narrative (Detail) - USD ($)	Jun. 30, 2016	Mar. 08, 2016	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Assets held for sale	$ 2,806,000		$ 2,900,000
Assets held-for-sale, selling price	2,800,000
Carrying value of notes receivable	1,000,000
Notes receivable, carrying value			1,000,000
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale securities	6,086,000		133,308,000
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash equivalents	101,000		11,628,000
Available-for-sale securities	6,086,000		133,308,000
Foreign exchange contracts	22,000		89,000
Foreign exchange contracts	204,000		36,000
Stock warrant	47,000		59,000
Contingent consideration	500,000		811,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash equivalents	56,000		10,133,000
Available-for-sale securities	0		0
Foreign exchange contracts	0		0
Foreign exchange contracts	0		0
Stock warrant	0		0
Contingent consideration	0		0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash equivalents	45,000		1,495,000
Available-for-sale securities	6,086,000		133,308,000
Foreign exchange contracts	22,000		89,000
Foreign exchange contracts	204,000		36,000
Stock warrant	0		0
Contingent consideration	0		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash equivalents	0		0
Available-for-sale securities	0		0
Foreign exchange contracts	0		0
Foreign exchange contracts	0		0
Stock warrant	47,000		59,000
Contingent consideration	500,000		811,000
Convertible Debt Securities | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Convertible debt securities	5,850,000		5,337,000
Convertible Debt Securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Convertible debt securities	0		0
Convertible Debt Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Convertible debt securities	0		0
Convertible Debt Securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Convertible debt securities	5,850,000		5,337,000
BioCision, LLC | Convertible Debt Securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Convertible debt securities	5,800,000		$ 5,300,000
Permanent Term Loan, Tranche One | BioCision, LLC
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Aggregate principal amount of bridge loans	600,000	$ 750,000
Other Assets | Permanent Term Loan, Tranche One | BioCision, LLC
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Aggregate principal amount of bridge loans	$ 1,500,000