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Goodwill and Intangible Assets
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
7. Goodwill and Intangible Assets
Goodwill
The carrying amount of goodwill was $26.3 million as of December 31, 2023. There was no change in the carrying amount of goodwill during the six months ended June 30, 2024.
Acquired Intangible Assets
Acquired intangible assets consisted of the following:
June 30, 2024
Gross carrying
value		Accumulated
amortization		Net carrying
value		Weighted-average remaining useful life (years)
(in thousands, except year data)
Developed technology$43,160 $17,213 $25,947 3.1
Other intangible assets600 600 — — 
Total acquired intangible assets$43,760 $17,813 $25,947 
December 31, 2023
Gross carrying
value		Accumulated
amortization		Net carrying
value		Weighted-average remaining useful life (years)
(in thousands, except year data)
Developed technology$43,160 $12,973 $30,187 3.6
Other intangible assets600 467 133 0.3
Total acquired intangible assets$43,760 $13,440 $30,320 
Amortization expense was $2.2 million and $2.3 million for the three months ended June 30, 2024 and 2023, respectively, and $4.4 million and $4.6 million for the six months ended June 30, 2024 and 2023, respectively.
Cryptocurrency
The net carrying value of our cryptocurrencies, which consisted primarily of Bitcoin and Ether, as well as all related cryptocurrency activity, was immaterial for the periods presented.