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Convertible Senior Notes (Tables)
 12 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Carrying Values of Company's 2026 Notes
The carrying values of the Company’s 2026 Notes are as follows (amounts shown in thousands):
September 30, 2022September 30, 2021
2026 Notes:
Principal amount$155,250 $155,250 
Less: unamortized discount and issuance costs, net of amortization(27,280)(34,332)
Carrying amount$127,970 $120,918 
2026 Notes embedded conversion derivative$— $48,208 
Schedule of Changes in Fair Value of Embedded Conversion Derivative he following table includes a rollforward of the contingent consideration liability measured at fair value using significant unobservable inputs (Level 3) during the twelve months ended September 30, 2022 (amounts in thousands):
Balance at September 30, 2021$16,770 
Expenses recorded due to changes in fair value(1,358)
Payment of contingent consideration associated with the ID R&D acquisition(9,492)
Balance at September 30, 2022$5,920 
The following table presents the fair value and the change in fair value for the embedded conversion derivative (amounts shown in thousands):
Embedded conversion derivative
Fair value as of September 30, 2021$48,208 
Remeasurement to fair value on March 3, 2022(19,692)
Impact of increase of authorized shares of common stock on convertible senior notes hedge(28,516)
Fair value as of September 30, 2022$— 
Schedule of Interest Costs Recognized Related to 2026 Notes
The following table presents the total amount of interest cost recognized relating to the 2026 Notes for the twelve months ended September 30, 2022 and 2021 (amounts shown in thousands):
20222021
Contractual interest expense$1,179 $756 
Amortization of debt discount and issuance costs7,053 4,372 
Total interest expense recognized$8,232 $5,128