Equity - Shares Reserved For Future Issuance (Details) - shares	Jan. 31, 2021	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	112,494,580	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)	64,574,656	80,903,200
2012 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	7,520,474	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 | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	1,828,083	0
2020 Plan | Pool
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	32,871,367	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