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Intangible Assets
 6 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets arose from the acquisition of SDI in fiscal year 2019 and the acquisitions of S&N and EMCORE Chicago in fiscal year 2022. Definite-lived intangible assets are amortized on a straight-line basis over the estimated useful life of: (a) 7.0 years for patents, (b) 8.0 years for customer relationships, and (c) 2.0-8.0 years for technology. Trademarks are indefinite-lived.

The following table summarizes changes in intangible assets, net:
(in thousands)March 31, 2024September 30, 2023
Balance at beginning of period$12,245 $14,790 
Changes from acquisition— 1,470
Write off due to impairment— (2,125)
Amortization(987)(1,890)
Balance at end of period$11,258 $12,245 

The weighted average remaining useful lives by definite-lived intangible asset category are as follows:
March 31, 2024
(in thousands, except weighted average remaining life)Weighted Average Remaining Life (in years)Gross Carrying AmountAccumulated AmortizationNet Book Value
Technology6.1$16,901 $(10,221)$6,680 
Customer relationships6.44,690 (967)3,723 
Definite-lived intangible assets total$21,591 $(11,188)$10,403 

As of March 31, 2024, the value of trademarks was approximately $0.9 million.

September 30, 2023
(in thousands, except weighted average remaining life)Weighted Average Remaining Life (in years)Gross Carrying AmountAccumulated AmortizationNet Book Value
Technology6.5$16,901 $(9,527)$7,374 
Customer relationships6.94,690 (674)4,016 
Definite-lived intangible assets total$21,591 $(10,201)$11,390 

As of September 30, 2023, the value of trademarks was approximately $0.9 million.

Estimated future amortization expense for intangible assets recorded by the Company as of March 31, 2024 is as follows:
(in thousands)Amount
2024$968 
20251,929 
20261,527 
20271,504 
20281,491 
Thereafter2,984 
Total amortization expense$10,403