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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	21.00%	21.00%	33.80%
State income taxes, net of federal benefit	4.00%	3.80%	3.40%
Change in valuation allowance	(100.10%)	(68.50%)	(27.10%)
Stock-based compensation	59.80%	45.50%	42.40%
Research and development credits	18.00%	0.00%	0.00%
Tax Cuts and Jobs Act of 2017	0.00%	0.00%	(51.30%)
Other, net	(2.00%)	(1.80%)	(0.90%)
Effective tax rate	0.70%	0.00%	0.30%

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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