| Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents | 153 | 174 | 674 | 89 | 126 | 678 | 171 | 156 | 114 | 50 |
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| Short-term investments | - | - | - | 532 | 407 | 8 | 234 | 266 | 122 | - |
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| Accounts receivable, net | 15 | 10 | 8 | 64 | 28 | 42 | 17 | 16 | 13 | 0 |
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| Inventories | - | - | - | - | 7 | 17 | 31 | 40 | 42 | 3 |
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| Prepaid expenses and other current assets | 4 | 3 | 5 | 5 | 133 | 10 | 20 | 14 | 42 | 32 |
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| Current assets held for sale | - | - | - | - | - | - | - | - | - | 111 |
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| Total current assets | 201 | 267 | 749 | 690 | 702 | 755 | 474 | 493 | 332 | 197 |
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| Restricted time deposits | 7 | - | - | - | - | - | 2 | 2 | 2 | - |
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| Property and equipment, net | 129 | 124 | 129 | 127 | 43 | 34 | 28 | 21 | 13 | - |
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| Operating lease right-of-use assets | - | - | - | - | - | - | 91 | 80 | 68 | - |
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| Other assets | 2 | 2 | 5 | 3 | 9 | 3 | 6 | 5 | 4 | 1 |
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| Long-term assets held for sale | - | - | - | - | - | - | - | - | - | 17 |
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| Total assets | 471 | 470 | 899 | 881 | 857 | 827 | 774 | 610 | 424 | 215 |
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| Accounts payable | 7 | 6 | 6 | 9 | 6 | 25 | 26 | 31 | 18 | 5 |
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| Accrued and other current liabilities | - | - | - | - | 84 | 120 | 173 | 220 | 173 | 62 |
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| Deferred revenue | - | - | - | 14 | 0 | 7 | 16 | 13 | 13 | 27 |
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| Operating Lease, Liability, Current | - | - | - | - | - | - | 11 | 10 | 14 | - |
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| Current liabilities held for sale | - | - | - | - | - | - | - | - | - | 39 |
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| Total current liabilities | 67 | 65 | 77 | 89 | 103 | 163 | 225 | 274 | 218 | 133 |
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| Product development obligations | 15 | 15 | 17 | 17 | 17 | 19 | 18 | 17 | 18 | 17 |
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| Deferred revenue, net of current | - | - | - | 136 | 99 | 138 | 187 | 186 | 158 | 115 |
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| Operating Lease, Liability, Noncurrent | - | - | - | - | - | - | 89 | 80 | 67 | - |
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| Secured Long-Term Debt, Noncurrent | - | - | - | - | - | - | - | - | 72 | 73 |
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| Liability Related To Sale Of Future Revenues Non Current | - | - | - | - | - | - | - | 49 | 51 | 59 |
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| Other long-term liabilities | 5 | 6 | 8 | 10 | 64 | 40 | 26 | 6 | 3 | 1 |
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| Long-term liabilities held for sale | - | - | - | - | - | - | - | - | - | 0 |
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| Total liabilities | 274 | 294 | 316 | 352 | 322 | 385 | 545 | 612 | 586 | 398 |
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| Redeemable non-controlling interests | - | - | - | - | - | - | - | - | 21 | 21 |
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| Preferred Stock, Value, Issued | - | - | - | - | - | - | - | - | - | - |
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| Common Stock, Value, Issued | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
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| Additional paid-in capital | 587 | - | - | 1,226 | 1,301 | 1,400 | 1,476 | 1,541 | 1,644 | 1,669 |
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| Accumulated other comprehensive loss | -2 | -1 | -2 | -2 | -1 | -4 | -4 | -6 | -7 | -6 |
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| Accumulated deficit | -408 | -470 | -596 | -716 | -785 | -974 | -1,264 | -1,558 | -1,842 | -1,889 |
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| Total stockholders' deficit attributable to FibroGen | 197 | 175 | 582 | 528 | 535 | 441 | 229 | -1 | -184 | -205 |
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| Nonredeemable Noncontrolling Interest | - | - | - | - | - | - | - | - | 20 | 20 |
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| Non-controlling interests | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | - | - |
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| Total deficit | 197 | 175 | 582 | 528 | 535 | 441 | 229 | -1 | -184 | -205 |
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| Total liabilities, redeemable non-controlling interests and deficit | 471 | 470 | 899 | 881 | 857 | 827 | 774 | 610 | 424 | 215 |
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