Fair Value Measurements - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 08, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charge	$ 800,000
Available-for-sale securities	6,135,000			$ 133,308,000
Assets held for sale	0			2,900,000
Long Lived Assets Held-for-sale, Selling Price		$ 2,800,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, Liabilities	97,000			36,000
Foreign exchange contracts, Assets	5,000
Contingent consideration	500,000			811,000
Cash equivalents	143,000			11,628,000
Available-for-sale securities	6,135,000			133,308,000
Stock warrant	45,000			59,000
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, Liabilities	0			0
Contingent consideration	0			0
Cash equivalents	98,000			10,133,000
Available-for-sale securities	0			0
Stock warrant	0			0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, Liabilities	97,000			36,000
Foreign exchange contracts, Assets	5,000			89,000
Contingent consideration	0			0
Cash equivalents	45,000			1,495,000
Available-for-sale securities	6,135,000			133,308,000
Stock warrant	0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, Liabilities	0			0
Foreign exchange contracts, Assets	0			0
Contingent consideration	500,000			811,000
Cash equivalents	0			0
Available-for-sale securities	0			0
Stock warrant	45,000			59,000
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale				2,900,000
Convertible Debt Securities [Member] | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt securities	5,774,000			5,337,000
Convertible Debt Securities [Member] | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt securities	0			0
Convertible Debt Securities [Member] | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt securities	0			0
Convertible Debt Securities [Member] | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt securities	5,774,000			5,337,000
BioCision, LLC | Convertible Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt securities	5,800,000			5,300,000
BioCision, LLC | Permanent Term Loan, Tranche One [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivable with Imputed Interest, Face Amount	600,000		$ 750,000
BioCision, LLC | Other Assets [Member] | Permanent Term Loan, Tranche One [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivable with Imputed Interest, Face Amount	$ 1,500,000
Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term used to measure fair value of warrant	5 years
Reported Value Measurement | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 200,000			$ 1,000,000