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Goodwill and intangible assets
 3 Months Ended
Dec. 31, 2022
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, 2022. Total amortization expense related to finite-lived intangible assets was $1.4 million for the three months ended December 31, 2022 and $0.8 million for the three months ended December 31, 2021.
The goodwill balance is presented below:

(in thousands)December 31, 2022September 30, 2022
Balance at beginning of period/year$85,811 $22,434 
Business acquisition – additions—61,768
Remeasurement adjustments to the deferred tax assets—1,609
Balance at end of period/year $85,811 $85,811 

The intangible assets balances are presented below:

December 31, 2022
(in thousands, except for years)Weighted average
Amortization period
in years		Gross
carrying
amount		Accumulated
amortization		Net book
value
Developed Technology15$50,020 $(5,190)$44,830 
Customer Relationships1115,210 (2,254)12,956 
Tradenames & Trademarks3900 (325)575 
Total finite-lived intangible assets$66,130 $(7,769)$58,361 

September 30, 2022
(in thousands, except for years)Weighted average
Amortization period
in years		Gross
carrying
amount		Accumulated
amortization		Net book
value
Developed Technology15$50,020 $(4,375)$45,645 
Customer Relationships1115,210 (1,767)13,443 
Tradenames & Trademarks3$900 $(250)$650 
Total finite-lived intangible assets$66,130 $(6,392)$59,738