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Basis of Presentation - Impact of Adoption of ASC Topic 606 on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Oct. 01, 2018	Sep. 30, 2018
Assets
Contract assets - royalties and license fees	$ 6,707
Deferred income taxes	4,778		$ 6,304
Income tax receivable	1,244		1,152
Liabilities and Stockholders' Equity
Deferred revenue, current portion			9,646
Deferred revenue, less current portion			11,247
Retained earnings	$ 104,423		$ 97,615
Adoption of ASC Topic 606 [Member]
Assets
Contract assets - royalties and license fees		$ 6,904
Deferred income taxes		5,089
Income tax receivable		762
Liabilities and Stockholders' Equity
Deferred revenue, current portion		9,628
Deferred revenue, less current portion		11,066
Retained earnings		103,113
Adjustments \| Adoption of ASC Topic 606 [Member]
Assets
Contract assets - royalties and license fees		6,904
Deferred income taxes		(1,215)
Income tax receivable		(390)
Liabilities and Stockholders' Equity
Deferred revenue, current portion		(18)
Deferred revenue, less current portion		(181)
Retained earnings		$ 5,498