ForgeRock, Inc. Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowance increase	$ 18,400	$ 8,900
Uncertain tax positions	5,786	2,811	$ 2,184	$ 1,794
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	123,600
Federal \| Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
R&D credits	4,200
Uncertain tax positions	4,200	1,800
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	85,400
State \| Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
R&D credits	1,500
Uncertain tax positions	1,500	900
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	121,100
Uncertain tax positions	$ 100	$ 100