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Fair Value Measurements (Tables) | 9 Months Ended
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Oct. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of financial assets and liabilities measured at fair value on a recurring basis | The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of October 31, 2018 and January 31, 2018, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):
| Fair Value Measurement at October 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 893 |  |  | $ | — |  |  | $ | — |  |  | $ | 893 |
Short-term investments: |  |  |  |  |  |  |
U.S. government treasury securities | 382,681 |  |  | — |  |  | — |  |  | 382,681 |
Total financial assets | $ | 383,574 |  |  | $ | — |  |  | $ | — |  |  | $ | 383,574 |
| Fair Value Measurement at January 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 45,918 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,918 |
Short-term investments: |  |  |  |  |  |  |
U.S. government treasury securities | 217,072 |  |  | — |  |  | — |  |  | 217,072 |
Total financial assets | $ | 262,990 |  |  | $ | — |  |  | $ | — |  |  | $ | 262,990 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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