Marketable Securities (Details) - USD ($) $ in Thousands |
Jul. 31, 2021 |
Jan. 31, 2021 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | $ 114,802 | $ 212,634 |
| Unrealized Gain | 5 | 20 |
| Unrealized Losses | (1) | (2) |
| Fair value | 114,806 | 212,652 |
| Corporate bonds | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 24,335 | 26,894 |
| Unrealized Gain | 0 | 0 |
| Unrealized Losses | (1) | (2) |
| Fair value | 24,334 | 26,892 |
| U.S. government and agency securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 65,476 | 125,804 |
| Unrealized Gain | 5 | 20 |
| Unrealized Losses | 0 | 0 |
| Fair value | 65,481 | 125,824 |
| Commercial paper | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 24,991 | 59,936 |
| Unrealized Gain | 0 | 0 |
| Unrealized Losses | 0 | 0 |
| Fair value | $ 24,991 | $ 59,936 |
| X | ||||||||||
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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