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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 370,705 $ 202,471
Stock-based compensation 18,680 13,185
Deferred revenue 1,960 1,312
Operating lease liabilities 42,073 39,060
Other reserves and accruals 6,414 3,750
Research and development and other credits 39,918 791
Convertible debt 0 477
Disallowed interest 4,507 1,292
Total deferred tax assets 484,257 262,338
Valuation allowance (361,606) (203,899)
Total deferred tax assets, net 122,651 58,439
Deferred tax liabilities:    
Convertible debt (50,963) 0
Deferred commissions (27,569) (19,424)
Capitalized internal-use software costs (2,248) (2,047)
Goodwill (262) (217)
Operating lease right-of-use assets (31,165) (29,697)
Depreciation and amortization (8,315) (6,492)
Total deferred tax liabilities (120,522) (57,877)
Net deferred tax asset $ 2,129 $ 562