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Stock-Based Compensation - Summary of Stock Based Compensation for Employees and Non Employees (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | $ 16,130 | $ 17,699 | $ 83,061 | $ 46,313
BridgeBio Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 15,490 | 13,869 | 78,216 | 37,454
Other Subsidiaries Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 640 | 390 | 4,845 | 774
Eidos |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation |  | 3,440 |  | 8,085
Research and Development Expense |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 4,808 | 6,932 | 46,541 | 17,743
Research and Development Expense | BridgeBio Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 4,198 | 4,974 | 44,661 | 13,194
Research and Development Expense | Other Subsidiaries Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 610 | 310 | 1,880 | 538
Research and Development Expense | Eidos |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation |  | 1,648 |  | 4,011
Selling, General and Administrative Expenses |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 11,322 |  | 36,520 |
Selling, General and Administrative Expenses | BridgeBio Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | 11,292 |  | 33,555 |
Selling, General and Administrative Expenses | Other Subsidiaries Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation | $ 30 |  | $ 2,965 |
General and Administrative Expense |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation |  | 10,767 |  | 28,570
General and Administrative Expense | BridgeBio Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation |  | 8,895 |  | 24,260
General and Administrative Expense | Other Subsidiaries Equity Plan |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation |  | 80 |  | 236
General and Administrative Expense | Eidos |  |  |  |
Employee And Non Employee Service Share Based Compensation [Line Items] |  |  |  |
Total stock-based compensation |  | $ 1,792 |  | $ 4,074

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