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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Mezzanine Warrants |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance, beginning | $ 0 | $ 767 |
Change in the fair value of warrant liabilities, included in Other expenses |  | 8,487 |
Settlement through exercise of warrants or payment of consideration |  | (9,254) |
Balance, ending | 0 | 0 |
Accrued Contingent Consideration |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance, beginning | 5,999 | 3,340 |
Change in the fair value of warrant liabilities, included in Other expenses | 3,389 | 3,851 |
Contingent consideration accrued at time of business combination | 13,032 | 1,877 |
Settlement through exercise of warrants or payment of consideration | (4,194) | (3,069) |
Balance, ending | $ 18,226 | 5,999 |
Accrued Expenses and Other Current Liabilities |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Contingent consideration |  | 10,223 | $ 3,813
Other Long-term Liabilities |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Contingent consideration |  | $ 8,003 | $ 2,186

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