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Intangible Assets, Net
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
During the nine months ended September 30, 2023, the Company acquired intangible assets of $6.8 million included with proprietary intellectual property, in connection with the acquisition of the Stella Purchased Assets. See Note 3.
Intangible assets as of September 30, 2023 and December 31, 2022 consisted of the following (in thousands):
September 30, 2023December 31, 2022Estimated Useful Life
(in years)
Trade names$5,550 $5,550 15
Proprietary intellectual property11,064 4,260 5
Customer relationships1,180 1,180 1
CLIA license1,307 1,307 3
19,101 12,297 
Less: accumulated amortization(6,086)(3,822)
Total intangible assets, net$13,015 $8,475 
Amortization expense for acquired intangible assets was $0.8 million and $0.5 million during the three months ended September 30, 2023 and 2022, respectively. Amortization expense for acquired intangible assets was $2.3 million and $2.0 million during the nine months ended September 30, 2023 and 2022, respectively. The estimated future amortization expense of acquired intangible assets as of September 30, 2023 is as follows (in thousands):
Remaining periods in the year ended December 31, 2023$682 
Year ended December 31, 20242,583 
Year ended December 31, 20252,583 
Year ended December 31, 20262,251 
Year ended December 31, 20271,731 
Thereafter3,185 
$13,015