Summary of Significant Accounting Policies - Assumptions of Stock Options And ESPP (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	0.00%
Share-Based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, minimum		50.20%	41.70%
Volatility, maximum		51.60%	50.40%
Expected term (in years)		6 years 14 days	6 years 21 days
Risk-free interest rate, minimum		0.52%	0.32%
Risk-free interest rate, maximum		1.08%	1.49%
Expected dividends		0.00%	0.00%
Weighted average grant date fair value (in dollars per share)		$ 8.86	$ 2.29
Share-Based Payment Arrangement, Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock fair value (in dollars per share)		27.49	7.86
Share-Based Payment Arrangement, Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock fair value (in dollars per share)		$ 4.97	$ 4.83
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, minimum	51.47%
Volatility, maximum	58.50%
Risk-free interest rate, minimum	1.54%
Risk-free interest rate, maximum	2.07%
Expected dividends	0.00%
Employee Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 months
Employee Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	1 year

ForgeRock, Inc. 10-K