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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Changes in Level 3 Financial Instruments Measured on a Recurring Basis The following tables present the changes in the Company's Level 3 financial instruments that are measured at fair value on a recurring basis.
Mezzanine WarrantsAccrued Contingent Consideration
Balance at September 30, 2017$767  $3,340  
Exercise of warrant liabilities into Common Units8,487  —  
Change in the fair value of warrant liabilities, included in Other expenses(9,254) —  
Contingent consideration accrued at time of business combination—  1,877  
Change in fair value of contingent consideration included in Operating expenses—  3,851  
Contingent consideration paid—  (3,069) 
Balance at September 30, 2018$—  $5,999  
Contingent consideration accrued at time of business combination—  13,032  
Change in fair value of contingent consideration included in Operating expenses—  3,389  
Contingent consideration paid—  (4,194) 
Balance at September 30, 2019$—  $18,226