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Income Taxes - Income Taxes Computed Using Federal Income Tax Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount computed using statutory rate |  |  |  |  |  |  |  |  |  |  |  |  | $ 841 | $ 2,122 | $ (1,078)
Net change in valuation allowance for net deferred tax assets |  |  |  |  |  |  |  |  |  |  |  |  | (459) | (367) | 10,058
AMT and other |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (191) | 20
Foreign rate differential |  |  |  |  |  |  |  |  |  |  |  |  | 664 | 22 | (169)
Non-deductible items |  |  |  |  |  |  |  |  |  |  |  |  | (151) | (276) | (370)
State income tax |  |  |  |  |  |  |  |  |  |  |  |  | (370) | 50 | (34)
Impact of tax reform on deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (4,901) | 0
Research and development credits |  |  |  |  |  |  |  |  |  |  |  |  | 1,694 | 475 | 2,494
Foreign income tax |  |  |  |  |  |  |  |  |  |  |  |  | (494) | 0 | 0
Stock compensation, net |  |  |  |  |  |  |  |  |  |  |  |  | 1,539 | 0 | 0
Income tax benefit (provision) | $ (1,597) | $ 2,712 | $ 794 | $ 1,355 | $ (783) | $ 1,430 | $ (99) | $ (3,614) | $ 11,012 | $ (17) | $ (74) | $ 0 | $ 3,264 | $ (3,066) | $ 10,921

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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