Income Taxes - Components of Deferred Tax Accounts Recognized for Financial Purposes (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Deferred tax assets:
Net operating loss and other carryforwards	$ 34,563	$ 36,492
Common stock options	1,134	961
Unearned revenue	389	439
Other	423	63
Total deferred tax assets	36,509	37,955
Deferred tax liabilities:
Fixed assets	0	(149)
Other	(144)	(157)
Total deferred tax liabilities	(144)	(306)
Net deferred tax asset	36,365	37,649
Valuation allowance	(36,299)	(37,525)
Equity gains on investment in Mediasite KK	(916)	(916)
Customer relationships	(718)	(716)
Goodwill amortization	(2,930)	(2,690)
Net deferred tax liability for goodwill and intangible assets amortization	$ (4,498)	$ (4,198)