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Business Combinations - Pro Forma Results (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |
Write-down of deferred tax assets from revaluation of net operating losses due to change in federal tax rate | $ 3,400 |  | $ 3,400
S3 |  |  |
Business Acquisition [Line Items] |  |  |
Revenue |  | $ 204,043 | 203,287
Net income (loss) |  | $ 2,044 | $ (1,456)
Number of shares outstanding - basic (in shares) |  | 12,018 | 11,881
Number of shares outstanding - diluted (in shares) |  | 13,041 | 12,873
Basic earnings per share (loss) (in dollars per share) |  | $ 0.17 | $ (0.12)
Diluted earnings per share (loss) (in dollars per share) |  | $ 0.16 | $ (0.11)
Write-down of deferred tax assets from revaluation of net operating losses due to change in federal tax rate |  |  | $ 3,400

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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