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Fair Value Measurements (Tables) | 3 Months Ended
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Apr. 30, 2015
Fair Value Disclosures [Abstract] |
Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables set forth the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of April 30, 2015 and January 31, 2015, using the above input categories (in thousands):
|  | April 30, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate paper |  |  | — |  |  | $ | 21,695 |  |  |  | — |  |  | $ | 21,695 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate paper |  |  | — |  |  |  | 40,810 |  |  |  | — |  |  |  | 40,810 |
U.S. government agency obligations |  |  | — |  |  |  | 20,295 |  |  |  | — |  |  |  | 20,295 |
Corporate debt securities |  |  | — |  |  |  | 15,515 |  |  |  | — |  |  |  | 15,515 |
Asset-backed securities |  |  | — |  |  |  | 15,334 |  |  |  | — |  |  |  | 15,334 |
U.S. government obligations |  |  | — |  |  |  | 12,035 |  |  |  | — |  |  |  | 12,035 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | — |  |  |  | 27,165 |  |  |  | — |  |  |  | 27,165 |
Money market funds |  |  | 1,202 |  |  |  | — |  |  |  | — |  |  |  | 1,202 |
Total assets measured at fair value |  | $ | 1,202 |  |  | $ | 152,849 |  |  | $ | — |  |  | $ | 154,051 |
|  | January 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | — |  |  | $ | 3,367 |  |  | $ | — |  |  | $ | 3,367 |
Total assets measured at fair value |  | $ | — |  |  | $ | 3,367 |  |  | $ | — |  |  | $ | 3,367 |

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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=36462937&loc=d3e19190-110258 + Details
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