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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($)
Statement Of Stockholders Equity [Abstract] |  |
Convertible senior notes, net of taxes | $ 4,678 | $ 4,678
Convertible senior notes, issuance costs | $ 629 | $ 629

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