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