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Debt (Tables)
 6 Months Ended
Mar. 31, 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:
 March 31, 2022March 31, 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 $(1,502)$142,248 $143,750 $(23,443)$120,307 $143,750 $(20,207)$123,543 
2025 Convertible Notes172,500 (2,580)169,920 172,500 (35,664)136,836 172,500 (31,857)140,643 
Total long-term debt$316,250 $(4,082)$312,168 $316,250 $(59,107)$257,143 $316,250 $(52,064)$264,186 
The following table presents the Company's contractual maturities related to the debt instruments as of March 31, 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 $— $143,750 $172,500 $— 
The following table presents the Company's interest expense related to the Convertible Notes for the three and six months ended March 31, 2022 and 2021:
Three Months Ended
March 31,
Six Months Ended
March 31,
(in thousands)2022202120222021
2024 Convertible Notes:
Contractual interest expense$1,033 $1,033 $2,066 $2,066 
Amortization of deferred financing costs142 111 309 223 
Amortization of debt discount— 1,461 — 2,891 
Total interest expense$1,175 $2,605 $2,375 $5,180 
2025 Convertible Notes:
Contractual interest expense$1,024 $1,024 $2,048 $2,048 
Amortization of deferred financing costs182 141 389 281 
Amortization of debt discount— 1,712 — 3,391 
Total interest expense$1,206 $2,877 $2,437 $5,720