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Debt (Tables)
 9 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long Term Debt Instruments
The Company adopted ASU 2020-06 on October 1, 2021. See Note 1: Organization And Summary Of Significant Accounting Policies for further discussion of this recently adopted accounting policy.
The following table presents the Company's debt instruments outstanding:
 June 30, 2022June 30, 2021
September 30, 2021
(in thousands)Gross AmountDebt Issuance CostsCarrying AmountGross AmountDebt Discount and Issuance CostsCarrying AmountGross AmountDebt Discount and Issuance CostsCarrying Amount
2024 Convertible Notes$143,750 $(1,346)$142,404 $143,750 $(21,840)$121,910 $143,750 $(20,207)$123,543 
2025 Convertible Notes172,500 (2,383)170,117 172,500 (33,778)138,722 172,500 (31,857)140,643 
Total long-term debt$316,250 $(3,729)$312,521 $316,250 $(55,618)$260,632 $316,250 $(52,064)$264,186 
The following table presents the Company's contractual maturities related to the debt instruments as of June 30, 2022:
 Schedule of Contractual Maturities
(in thousands)TotalLess Than 1 Year1 - 3 Years3 - 5 YearsMore Than 5 Years
2024 Convertible Notes$143,750 $— $143,750 $— $— 
2025 Convertible Notes172,500 — 172,500 — — 
$316,250 $— $316,250 $— $— 
The following table presents the Company's interest expense related to the Convertible Notes for the three and nine months ended June 30, 2022 and 2021:
Three Months Ended
June 30,
Nine Months Ended
June 30,
(in thousands)2022202120222021
2024 Convertible Notes:
Contractual interest expense$1,033 $1,033 $3,099 $3,100 
Amortization of deferred financing costs156 112 465 335 
Amortization of debt discount— 1,490 — 4,381 
Total interest expense$1,189 $2,635 $3,564 $7,816 
2025 Convertible Notes:
Contractual interest expense$1,025 $1,024 $3,073 $3,073 
Amortization of deferred financing costs197 139 586 420 
Amortization of debt discount— 1,747 — 5,138 
Total interest expense$1,222 $2,910 $3,659 $8,631