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Related Party Transactions - Schedule of Related Party Transactions (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Research and development | $ 136,827 | $ 92,321 | $ 43,978
Sales and marketing | 28,395 | 18,270 | 8,385
General and administrative | 71,055 | 50,722 | $ 35,966
Assets |  |  |
Prepaid expenses and other current assets | 28,325 | 23,081 |
Operating lease right-of-use assets | 9,470 | 4,613 |
Other noncurrent assets | 4,437 | 5,155 |
Liabilities |  |  |
Accounts payable | 5,230 | 5,599 |
Current portion of operating lease liabilities | 3,366 | 710 |
Unearned revenue | 10,678 | 12,087 |
Operating lease liabilities, net of current portion | 14,359 | 7,395 |
UMD [Member] |  |  |
Assets |  |  |
Operating lease right-of-use assets | 3,120 | 3,452 |
Liabilities |  |  |
Current portion of operating lease liabilities | 681 | 661 |
Unearned revenue | 204 | 2,670 |
Operating lease liabilities, net of current portion | 2,843 | 3,181 |
Duke [Member] |  |  |
Assets |  |  |
Prepaid expenses and other current assets | 520 | 520 |
Other noncurrent assets | $ 285 | $ 805 |

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