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Marketable Securities | 3 Months Ended
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Apr. 30, 2015
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | Note 4. Marketable Securities We held no cash equivalents and marketable securities as of January 31, 2015. The following is a summary of our cash equivalents and marketable securities as of April 30, 2015 (in thousands).
|  | April 30, 2015 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Fair Value |
Corporate paper |  | $ | 62,496 |  |  | $ | 10 |  |  | $ | (1 | ) |  | $ | 62,505 |
U.S. government agency obligations |  |  | 20,295 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 20,295 |
Corporate debt securities |  |  | 15,518 |  |  |  | 4 |  |  |  | (7 | ) |  |  | 15,515 |
Asset-backed securities |  |  | 15,335 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 15,334 |
U.S. government obligations |  |  | 12,037 |  |  |  | — |  |  |  | (2 | ) |  |  | 12,035 |
|  | $ | 125,681 |  |  | $ | 16 |  |  | $ | (13 | ) |  | $ | 125,684 |
Included in cash and cash equivalents |  | $ | 21,692 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 21,695 |
Included in marketable investments |  | $ | 103,989 |  |  | $ | 13 |  |  | $ | (13 | ) |  | $ | 103,989 |
None of our marketable securities had been in an unrealized loss position for greater than 12 months as of April 30, 2015. Based on our evaluation of available evidence we concluded that the gross unrealized losses on our marketable securities as of April 30, 2015, are temporary in nature. The amortized cost and estimated fair value of our cash equivalents and marketable securities as of April 30, 2015 are shown below by contractual maturity (in thousands).
|  | April 30, 2015 |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Less than one year |  | $ | 112,196 |  |  | $ | 112,200 |
Due in one to five years |  |  | 13,485 |  |  |  | 13,484 |
|  | $ | 125,681 |  |  | $ | 125,684 |
Net realized gains and losses from sales of our available-for-sale securities for the three months ended April 30, 2015 were not significant.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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