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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 8. Goodwill and Intangible Assets There have been no changes in the carrying amount of goodwill since its recognition in 2015. Intangible assets subject to amortization as of December 31, 2023 and 2022 consisted of the following (in thousands):
|  | December 31, 2023 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Acquired developed technology |  | $ | 20,000 |  |  | $ | (14,970 | ) |  | $ | 5,030 |
Purchased intellectual property |  |  | 325 |  |  |  | (227 | ) |  |  | 98 |
Balance at December 31, 2023 |  | $ | 20,325 |  |  | $ | (15,197 | ) |  | $ | 5,128 |
|  | December 31, 2022 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Acquired developed technology |  | $ | 20,000 |  |  | $ | (13,304 | ) |  | $ | 6,696 |
Purchased intellectual property |  |  | 325 |  |  |  | (194 | ) |  |  | 131 |
Balance at December 31, 2022 |  | $ | 20,325 |  |  | $ | (13,498 | ) |  | $ | 6,827 |
The developed technology was acquired in connection with our acquisition of Sequenta, Inc. in 2015. The remaining balance of the acquired developed technology and the purchased intellectual property is expected to be amortized over the next 3.0 years. As of December 31, 2023, expected future amortization expense for intangible assets was as follows (in thousands):
2024 |  | $ | 1,703 |
2025 |  |  | 1,699 |
2026 |  |  | 1,699 |
2027 |  |  | 27 |
Total future amortization expense |  | $ | 5,128 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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