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Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies - ASC 606 Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net | $ 46,371 | $ 49,819 | [1]
Property, equipment and improvements, net | 11,827 | 8,354 | [1]
Deferred tax assets | 5,503 | 6,600 | [1]
Unearned revenue current |  | 3,177 |
Other non-current liabilities | 392 | 720 | [1]
Retained earnings | $ 156,643 | 151,961 | [1]
As Reported |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net |  | 50,817 |
Property, equipment and improvements, net |  | 6,270 |
Deferred tax assets |  | 6,665 |
Unearned revenue current |  | 2,579 |
Other non-current liabilities |  | 510 |
Retained earnings |  | 151,748 |
Impact of Adoption | ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net |  | (998) |
Property, equipment and improvements, net |  | 2,084 |
Deferred tax assets |  | (65) |
Unearned revenue current |  | 598 |
Other non-current liabilities |  | 210 |
Retained earnings |  | $ 213 |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.

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