Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Payment	Jun. 30, 2013	Sep. 30, 2013
Income Tax Disclosure [Line Items]
Income tax provisions associated with income from continuing operations	$ 1,729,000	$ 1,122,000	$ 4,407,000	$ 3,916,000
Effective tax rates	32.00%	26.10%	31.10%	26.50%
U.S. federal statutory tax rate	35.00%	35.00%	35.00%	35.00%
Permanent tax and discrete tax benefits	100,000	200,000	300,000	800,000
Federal R&D tax credits				400,000
Number of Vessix contingent consideration payments			2
Gain on contingent consideration payments			700,000
Gain on sale of Vessix, OctoPlus N.V				1,300,000
Securities in available-for-sale investment			100,000	200,000
Income tax expense from discontinued operations		183,000		516,000
Effective tax rate applied to discontinued operations	34.80%	134.60%	34.80%	44.80%
Income tax benefit from discontinued operations	(41,000)	183,000	(41,000)	516,000
Unrecognized tax benefits including interest and penalties	900,000		900,000		1,000,000
Liability for unrecognized tax benefits to change significantly in the next 12 months	0		0
Maximum [Member]
Income Tax Disclosure [Line Items]
Income tax benefit from discontinued operations	$ (100,000)		$ (100,000)