Balance Sheet Components - Intangible Assets (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2020 |
Jan. 31, 2021 |
Jan. 31, 2020 |
|
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | $ 18,681 | $ 1,966 | |
| Accumulated Amortization | 3,004 | 1,439 | |
| Net Amount | 15,677 | 527 | |
| Developed technology | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 14,513 | 1,238 | |
| Accumulated Amortization | 2,193 | 1,067 | |
| Net Amount | $ 12,320 | $ 171 | |
| Weighted-Average Remaining Useful Life | 60 months | 56 months | 9 months |
| Customer relationships | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | $ 3,769 | $ 607 | |
| Accumulated Amortization | 649 | 280 | |
| Net Amount | $ 3,120 | $ 327 | |
| Weighted-Average Remaining Useful Life | 60 months | 54 months | 33 months |
| Other acquired intangible assets | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | $ 399 | $ 121 | |
| Accumulated Amortization | 162 | 92 | |
| Net Amount | $ 237 | $ 29 | |
| Weighted-Average Remaining Useful Life | 185 months | 9 months | |