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Income Taxes - Components of Net Deferred Tax Balances (Details) - USD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Deferred tax assets        
Net operating loss carryforwards $ 682,872 $ 423,379    
Accruals and reserves 14,744 5,668    
Stock-based compensation 30,377 33,405    
Operating lease liability 36,148 40,495    
Research and development credits 60,386 39,480    
Other 14,398 7,536    
Total deferred tax assets 838,925 549,963    
Less: Valuation allowance (723,767) (445,746) $ (282,141) $ (119,153)
Deferred tax assets, net of valuation allowance 115,158 104,217    
Deferred tax liabilities        
Operating lease right-of-use asset (27,654) (32,736)    
Deferred contract acquisition costs (61,432) (36,567)    
Convertible debt (18,854) (24,737)    
Acquired intangibles (11,939) (13,493)    
Other (893) (1,457)    
Total deferred tax liabilities (120,772) (108,990)    
Net deferred tax liabilities $ (5,614) $ (4,773)