Income Taxes - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2020	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Line Items]
Federal corporate tax rate		21.00%
Valuation allowance increase (decrease), amount		$ (15.1)	$ 26.5
Foreign
Income Tax Disclosure [Line Items]
Net operating loss carry forwards		$ 318.4
Foreign | United Kingdom Tax Department
Income Tax Disclosure [Line Items]
Percentage of corporate income tax rate	17.00%	19.00%
Remeasured UK deferred tax assets benefit		$ 6.5
Federal
Income Tax Disclosure [Line Items]
Net operating loss carry forwards		697.1
Tax credit carry forward		$ 39.1
Operating loss carryforwards expiration year		2025
Research and development tax credit carryforwards expiration year		2025
Net operating loss carry forwards with indefinite expiration		$ 75.3
State
Income Tax Disclosure [Line Items]
Net operating loss carry forwards		561.7
Tax credit carry forward		$ 41.2
Operating loss carryforwards expiration year		2022