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Summary of Significant Accounting Policies and Select Balance Sheet Information - Impact of Adoption of ASC Topic 606 on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Assets |  |  |
Contract assets - royalties and license fees | $ 8,210 |  |
Deferred income taxes | 6,176 |  | $ 6,304
Income tax receivable | 558 |  | 1,152
Liabilities and Stockholders' Equity |  |  |
Deferred revenue, current portion |  |  | 9,646
Deferred revenue, less current portion |  |  | 11,247
Retained earnings | 110,705 |  | $ 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 | 1,200 | (1,215) |
Income tax receivable | $ 400 | (390) |
Liabilities and Stockholders' Equity |  |  |
Deferred revenue, current portion |  | (18) |
Deferred revenue, less current portion |  | (181) |
Retained earnings |  | $ 5,498 |

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