| Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents | 113 | 321 | 235 | 143 | 141 |
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| Marketable securities | 884 | 1,127 | 826 | 928 | 770 |
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| Prepaid expenses and other current assets | 12 | 16 | 11 | 13 | 12 |
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| Total current assets | 1,009 | 1,463 | 1,072 | 1,084 | 922 |
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| Property and equipment, net | 44 | 166 | 296 | 313 | 300 |
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| Right-of-use assets - finance lease | - | 31 | 28 | 25 | 22 |
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| Operating Lease, Right-of-Use Asset | 12 | 37 | 61 | 56 | 51 |
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| Other assets | 2 | 18 | 18 | 24 | 26 |
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| Total assets | 1,067 | 1,716 | 1,475 | 1,502 | 1,322 |
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| Accounts payable | 5 | 14 | 21 | 13 | 6 |
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| Accrued liabilities | 3 | 6 | 7 | 10 | 17 |
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| Accrued compensation and benefits | 2 | 9 | 13 | 26 | 32 |
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| Operating Lease, Liability, Current | 1 | 1 | 3 | 5 | 6 |
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| Finance Lease, Liability, Current | - | 0 | 1 | 3 | 3 |
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| Total current liabilities | 12 | 31 | 47 | 57 | 65 |
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| Operating lease liability, long-term | 11 | 37 | 63 | 58 | 53 |
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| Finance lease liability, long-term | - | 39 | 38 | 35 | 32 |
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| Other liabilities | - | 0 | 8 | 12 | 15 |
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| Total liabilities | 24 | 107 | 156 | 162 | 165 |
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| Redeemable non-controlling interest | 2 | 2 | 2 | 2 | - |
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| Common Stock, Value, Issued | 0 | 0 | 0 | 0 | 0 |
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| Additional paid-in-capital | 2,437 | 3,635 | 3,771 | 4,222 | 4,516 |
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| Accumulated other comprehensive loss | -0 | -4 | -18 | -3 | 0 |
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| Accumulated deficit | -1,396 | -2,024 | -2,436 | -2,881 | -3,359 |
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| Total stockholders’ equity | 1,041 | 1,607 | 1,318 | 1,338 | 1,158 |
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| Total liabilities, redeemable non-controlling interest and stockholders’ equity | 1,067 | 1,716 | 1,475 | 1,502 | 1,322 |
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