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Goodwill and intangible assets
 3 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets Goodwill and intangible assets
There were no changes to the carrying value of goodwill during the three months ended December 31, 2023. Total amortization expense related to finite-lived intangible assets was $1.3 million for the three months ended December 31, 2023 and $1.4 million for the three months ended December 31, 2022.
The goodwill balance is presented below:

(in thousands)December 31, 2023September 30, 2023
Balance at beginning of period/year$85,811 $85,811 
Balance at end of period/year $85,811 $85,811 
The intangible assets balances are presented below:

December 31, 2023
(in thousands, except for years)Weighted average
Amortization period
in years		Gross
carrying
amount		Accumulated
amortization		Net book
value
Developed Technology15$50,020 $(8,451)$41,569 
Customer Relationships1115,210 (3,864)11,346 
Tradenames & Trademarks3900 (625)275 
Total finite-lived intangible assets$66,130 $(12,940)$53,190 

September 30, 2023
(in thousands, except for years)Weighted average
Amortization period
in years		Gross
carrying
amount		Accumulated
amortization		Net book
value
Developed Technology15$50,020 $(7,636)$42,384 
Customer Relationships1115,210 (3,461)11,749 
Tradenames & Trademarks3$900 $(550)$350 
Total finite-lived intangible assets$66,130 $(11,647)$54,483