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Stock-Based Compensation - Additional Information (Details) |  |  | 3 Months Ended | 6 Months Ended |
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Nov. 18, 2020 USD ($) Grantee shares | Apr. 22, 2020 USD ($) Grantee shares | Jun. 30, 2022 USD ($) Employee shares | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Employee $ / shares shares | Jun. 30, 2021 USD ($) | Dec. 31, 2021 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation |  |  | $ 28,305,000 | $ 32,035,000 | $ 52,586,000 | $ 66,931,000 |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grand date fair value of options granted | $ / shares |  |  |  |  | $ 6.72 |  |
2020 Stock and Equity Award Exchange Program |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation cost associated with performance-based milestone awards |  |  | $ 3,400,000 | 13,300,000 | $ 2,500,000 | 27,800,000 |
Maximum potential milestone performance-based awards to be settled in fully-vested RSA | $ 11,700,000 | $ 183,400,000 |  |  |  |  |
Performance-based milestone awards |  | $ 17,400,000 |  |  |  |  |
2020 Stock and Equity Award Exchange Program | Minimum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance-based milestone awards period for recognition |  | 8 months 12 days |  |  |  |  |
2020 Stock and Equity Award Exchange Program | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance-based milestone awards period for recognition |  | 1 year 8 months 12 days |  |  |  |  |
Employee Stock Options | 2020 Stock and Equity Award Exchange Program |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of options issued in exchange of subsidiary equity | shares | 70,436 | 1,268,110 |  |  |  |  |
Restricted Stock Awards | 2020 Stock and Equity Award Exchange Program |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of RSAs issued in exchange of subsidiary equity | shares |  | 50,145 |  |  |  |  |
Performance based milestone awards compensation expense settled with equity |  |  |  | 2,500,000 |  | 6,000,000.0 |
Performance-Based RSAs | 2020 Stock and Equity Award Exchange Program |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of Performance-Based RSAs issued in exchange of subsidiary equity | shares |  | 22,611 |  |  |  |  |
Performance-Based Stock Options | 2020 Stock and Equity Award Exchange Program |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of Performance-Based stock options issued in exchange of subsidiary equity | shares | 10,772 |  |  |  |  |  |
A&R 2019 Plan | 2020 Stock and Equity Award Exchange Program |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of grantees | Grantee | 16 | 149 |  |  |  |  |
Number of shares issued in exchange of subsidiary equity | shares | 24,924 | 554,064 |  |  |  |  |
2021 A&R Plan | Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  | 6,827,622 |  | 6,827,622 |  |
2019 Inducement Plan | Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  | 180,857 |  | 180,857 |  |
Eidos Award Exchange Plan | Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  |  |  |  |  | 2,802,644
A&R 2019 Plan and 2019 Inducement Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grand date fair value of options granted | $ / shares |  |  |  |  | $ 5.24 |  |
Total intrinsic value of options exercised |  |  |  |  | $ 800,000 |  |
Stock-based compensation |  |  | $ 1,483,000 |  |  |  |
A&R 2019 Plan and 2019 Inducement Plan | Employee Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |
Stock-based compensation |  |  | 9,400,000 |  | $ 20,200,000 |  |
Unrecognized compensation cost |  |  | 79,700 |  | $ 79,700 |  |
Unrecognized compensation cost, period for recognition |  |  |  |  | 2 years 3 months 18 days |  |
A&R 2019 Plan and 2019 Inducement Plan | Restricted Stock Awards |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  | $ 2,968,000 |  |
Unrecognized compensation cost, period for recognition |  |  |  |  | 1 year 6 months |  |
Unrecognized compensation cost |  |  | 7,200 |  | $ 7,200 |  |
A&R 2019 Plan and 2019 Inducement Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation |  |  | 12,100,000 |  | 24,000,000.0 |  |
Unrecognized compensation cost |  |  | 126,100,000 |  | $ 126,100,000 |  |
Unrecognized compensation cost, period for recognition |  |  |  |  | 2 years 6 months |  |
BridgeBio Equity Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance-based milestone awards compensation expense |  |  |  | 1,900,000 | $ 200,000 | 3,200,000 |
Stock-based compensation |  |  | $ 28,145,000 | $ 31,695,000 | $ 52,326,000 | $ 62,726,000 |
BridgeBio Equity Plan | 2019 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  | 4,107,805 |  | 4,107,805 |  |
Stock-based compensation |  |  | $ 700,000 |  | $ 1,400,000 |  |
Eidos | Eidos 2016 and 2018 Plans |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of options issued in exchange of subsidiary equity | shares |  |  |  |  | 2,776,672 |  |
Number of RSUs issued in exchange of subsidiary equity | shares |  |  |  |  | 25,972 |  |
Number of employees for replacement awards | Employee |  |  | 88 |  | 88 |  |
Incremental compensation cost for awards modification |  |  | $ 0 |  | $ 0 |  |

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