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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Net income (loss) $ 1,648 $ 2,904 [1] $ 7,672 $ (1,709) [1]
Denominator:        
Denominator for basic net income (loss) per common share — weighted average shares outstanding 28,072,000 27,177,000 [1] 27,816,000 27,002,000 [1]
Effect of dilutive securities:        
Stock options and restricted stock units 517,000 587,000 [1] 598,000 0 [1]
Denominator for diluted net income (loss) per common share — adjusted weighted average shares 28,589,000 27,764,000 [1] 28,414,000 27,002,000 [1]
Basic net income (loss) per common share:        
Net income (loss), basic (USD per share) $ 0.06 $ 0.11 [1] $ 0.28 $ (0.06) [1]
Diluted net income (loss) per common share        
Net income (loss), diluted (USD per share) $ 0.06 $ 0.10 [1] $ 0.27 $ (0.06) [1]
Potentially dilutive securities excluded from computation of earnings per share 617,841 770,178 667,841 977,828
Excluded incremental common shares related to common stock options and restricted stock units       440,002
[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.