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Stock-Based Compensation - Additional Information (Details) |  |  | 3 Months Ended | 9 Months Ended
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Nov. 18, 2020 USD ($) Grantee shares | Apr. 22, 2020 USD ($) Grantee shares | Sep. 30, 2021 USD ($) Employee shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Employee $ / shares shares | Sep. 30, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  | $ 16,130,000 | $ 17,699,000 | $ 83,061,000 | $ 46,313,000
Employee Stock Purchase Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  | 4,235,440 |  | 4,235,440 |
Weighted-average grand date fair value of options granted | $ / shares |  |  |  |  | $ 16.29 |
2020 Stock and Equity Award Exchange Program |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation cost associated with milestone awards |  |  |  |  | $ 25,800,000 |
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 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grand date fair value of options granted | $ / shares |  |  |  |  | $ 31.03 |
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 |  |  | $ 700,000 |  | $ 6,700,000 |
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 |  |  |  |
A&R 2019 Plan | Common Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  | 7,977,872 |  | 7,977,872 |
2019 Inducement Plan | Common Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for future issuance | shares |  |  | 8,938 |  | 8,938 |
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 |  | 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 |  |  |  |  | $ 31.03 |
Total intrinsic value of options exercised |  |  |  |  | $ 50,400,000 |
A&R 2019 Plan and 2019 Inducement Plan | 2020 Stock and Equity Award Exchange Program |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  |  |  | $ 23,427,000 |
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 |  |  | $ 8,100,000 |  | $ 21,900,000 |
Unrecognized compensation cost |  |  | 71,600,000 |  | $ 71,600,000 |
Unrecognized compensation cost, period for recognition |  |  |  |  | 2 years 1 month 6 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 |  |  | 1,486,000 |  | $ 28,181,000 |
Unrecognized compensation cost, period for recognition |  |  |  |  | 2 years 1 month 6 days |
Unrecognized compensation cost |  |  | 11,700,000 |  | $ 11,700,000 |
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 |  |  | 6,400,000 |  | $ 16,800,000 |
Unrecognized compensation cost, period for recognition |  |  |  |  | 3 years 1 month 6 days |
Unrecognized compensation cost |  |  | 80,000,000.0 |  | $ 80,000,000.0 |
BridgeBio Equity Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Performance-based milestone awards compensation expense |  |  | 100,000 |  | 3,300,000 |
Stock-based compensation |  |  | $ 15,490,000 | 13,869,000 | $ 78,216,000 | 37,454,000
Eidos |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 3,440,000 |  | $ 8,085,000
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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