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Fair Value Measurements (Tables) | 3 Months Ended
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Apr. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
| As of April 30, 2017
| (unaudited)
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 217,651 |  |  | $ | — |  |  | $ | — |  |  | $ | 217,651 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | — |  |  | 2,500 |  |  | — |  |  | 2,500 |
Total short-term investments | — |  |  | 2,500 |  |  | — |  |  | 2,500 |
Total cash equivalents and short-term investments | $ | 217,651 |  |  | $ | 2,500 |  |  | $ | — |  |  | $ | 220,151 |
| As of January 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 10,565 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,565 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities | — |  |  | 1,538 |  |  | — |  |  | 1,538 |
Corporate debt securities | — |  |  | 12,852 |  |  | — |  |  | 12,852 |
Total short-term investments | — |  |  | 14,390 |  |  | — |  |  | 14,390 |
Total cash equivalents and short-term investments | $ | 10,565 |  |  | $ | 14,390 |  |  | $ | — |  |  | $ | 24,955 |
Liabilities: |  |  |  |  |  |  |
Series B redeemable convertible preferred stock warrant | $ | — |  |  | $ | — |  |  | $ | 304 |  |  | $ | 304 |
Schedule of Changes in Series B Redeemable Convertible Preferred Stock Warrant Fair Value | The change in the fair value of the Series B redeemable convertible preferred stock warrant was as follows (in thousands):
Balance at January 31, 2017 | $ | 304 |
Increase in fair value of warrant through exercise date | 103 |
Reclassification of remaining warrant liability to additional paid-in capital | (407 | )
Balance at April 30, 2017 | $ | — |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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