Equity - Shares Reserved For Future Issuance (Details) - shares	Oct. 31, 2020	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	117,292,639	251,269,209
Common stock warrants
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	0	32,336
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	5,700,000	0
2012 Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	69,634,367	80,903,200
2012 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	7,616,097	0
2012 Plan | Pool
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	0	412,401
2020 Plan | Pool
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	34,342,175	0
Redeemable Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	0	169,921,272