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Business Combinations - Pro Forma Information (Details) - SSS - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 51,344 | $ 53,578 | $ 151,654 | $ 154,570
Net income (loss) | $ (191) | $ 752 | $ 1,346 | $ 2,262
Number of shares outstanding - basic (in shares) | 12,036 | 11,899 | 12,011 | 11,875
Number of shares outstanding - diluted (in shares) | 13,077 | 12,884 | 13,048 | 12,872
Basic earnings per share (loss) (in dollars per share) | $ (0.02) | $ 0.06 | $ 0.11 | $ 0.19
Diluted earnings per share (loss) (in dollars per share) | $ (0.01) | $ 0.06 | $ 0.10 | $ 0.18

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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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