Stock-Based Compensation - Stock options - Summary (Details) - $ / shares |
3 Months Ended | |
|---|---|---|
Apr. 30, 2021 |
Apr. 30, 2020 |
|
| Number of Shares | ||
| Options outstanding at beginning of period (in shares) | 6,646,000 | |
| Options granted (in shares) | 93,000 | 0 |
| Exercised (in shares) | (769,000) | |
| Canceled (in shares) | (58,000) | |
| Options outstanding at end of period (in shares) | 5,912,000 | |
| Options vested and expected to vest at end of period (in shares) | 5,912,000 | |
| Options exercisable at end of period (in shares) | 3,232,000 | |
| Weighted-Average Exercise Price Per Share | ||
| Options outstanding at beginning of period (in usd per share) | $ 8.24 | |
| Granted (in usd per share) | 3.19 | |
| Exercised (in usd per share) | 4.88 | |
| Canceled (in usd per share) | 11.48 | |
| Options outstanding at end of period (in usd per share) | 8.57 | |
| Options vested and expected to vest at end of period (in usd per share) | 8.57 | |
| Options exercisable at end of period (in usd per share) | $ 5.59 | |
| X | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
|
| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
|
| X | ||||||||||
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|