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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
[1]
Sep. 30, 2017
[1]
Income Tax Disclosure [Abstract]      
Statutory income tax amount $ 2,341 $ 809 $ 3,249
State taxes, net of federal benefits 196 (71) 124
Manufacturing deduction 0 (364) (150)
Transaction costs 0 79 0
Employee stock purchase plan 59 56 79
Foreign operations 225 318 (142)
Non-deductible executive compensation 171 27 0
Change in valuation allowance 520 (994) 77
Utilization of research and development tax credits (2,112) (1,971) (1,405)
One-time transition tax 0 250 0
Deferred balance sheet remeasure 9 2,727 0
ASU 2016-09 excess stock compensation (56) 643 0
Contingent consideration 250 388 (1,172)
Changes from provision to return (511) (554) (196)
Adjustment of tax contingency reserves 146 193 (370)
Other, net (51) 83 53
Income tax provision $ 1,187 $ 1,619 $ 147
[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.