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Marketable Securities and Fair Value Measurements (Tables) | 12 Months Ended
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Jan. 31, 2016
Investments Debt And Equity Securities [Abstract] |
Summary of Marketable Securities | We held no marketable securities as of January 31, 2015. The following is a summary of our marketable securities as of January 31, 2016 (in thousands).
|  | January 31, 2016 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Fair Value |
Corporate debt securities |  | $ | 5,560 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 5,559 |
Asset-backed securities |  |  | 1,821 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,820 |
|  | $ | 7,381 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 7,379 |
Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity | The amortized cost and estimated fair value of our marketable securities as of January 31, 2016 are shown below by contractual maturity (in thousands).
|  | January 31, 2016 |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Less than one year |  | $ | 5,560 |  |  | $ | 5,559 |
Due in one to five years |  |  | 1,821 |  |  |  | 1,820 |
|  | $ | 7,381 |  |  | $ | 7,379 |
Fair Value of Assets 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 January 31, 2016 and 2015, using the above input categories (in thousands):
|  | January 31, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 5,559 |  |  | $ | — |  |  | $ | 5,559 |
Asset-backed securities |  |  | — |  |  |  | 1,820 |  |  |  | — |  |  |  | 1,820 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | — |  |  |  | 26,968 |  |  |  | — |  |  |  | 26,968 |
Money market funds |  |  | 984 |  |  |  | — |  |  |  | — |  |  |  | 984 |
Total assets measured at fair value |  | $ | 984 |  |  | $ | 34,347 |  |  | $ | — |  |  | $ | 35,331 |
|  | 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 |
Fair Value of Redeemable Convertible Preferred Stock Warrants | The following table provides a roll-forward of the fair value of the redeemable convertible preferred stock warrants categorized as Level 3 (in thousands):
Balance at January 31, 2013 |  | $ | 2,869 |
Remeasurement |  |  | 8,477 |
Exercise of redeemable convertible preferred stock warrants |  |  | (10,000 | )
Balance at January 31, 2014 |  |  | 1,346 |
Remeasurement |  |  | (126 | )
Exercise of redeemable convertible preferred stock warrants |  |  | (1,220 | )
Balance at January 31, 2015 |  | $ | — |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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=36462937&loc=d3e19190-110258 + Details
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