Income Taxes - Additional Information (Details) - USD ($)	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 136,981,000	$ 101,502,000
Unrecognized tax benefits that would impact effective tax rate	100,000	$ 100,000	$ 0
Undistributed earnings of foreign subsidiaries	1,900,000
Unrecognized deferred tax liability related to undistributed earnings of foreign subsidiaries	200,000
Significant change in unrecognized tax benefits within the next twelve months	0
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	659,700,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	475,300,000
Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	6,600,000
Ireland | Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	258,800,000
United Kingdom | Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 7,200,000