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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Numerator:    
Net income (loss) $ 4,682 $ (4,487) [1]
Denominator:    
Denominator for basic net income (loss) per common share — weighted average shares outstanding 27,513,000 26,748,000 [1]
Effect of dilutive securities:    
Stock options and restricted stock units 562,000 0 [1]
Denominator for diluted net income (loss) per common share — adjusted weighted average shares 28,075,000 26,748,000 [1]
Basic net income (loss) per common share:    
Net income (loss), basic (USD per share) $ 0.17 $ (0.17) [1]
Diluted net income (loss) per common share    
Net income (loss), diluted (USD per share) $ 0.17 $ (0.17) [1]
Potentially dilutive securities excluded from computation of earnings per share 1,241,964 1,998,740
Excluded incremental common shares related to common stock options and restricted stock units   331,021
[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.