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Cash Equivalents and Short-term Investments | 3 Months Ended
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Apr. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Short-term Investments | Cash Equivalents and Short-term Investments The amortized costs, unrealized gains and losses and estimated fair values of the Company’s cash equivalents and short-term investments as of April 30, 2017 and January 31, 2017 were as follows (in thousands):
| As of April 30, 2017
| (unaudited)
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 217,651 |  |  | $ | — |  |  | $ | — |  |  | $ | 217,651 |
Investments: |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | 2,500 |  |  | — |  |  | — |  |  | 2,500 |
Total short-term investments | $ | 2,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,500 |
Total | $ | 220,151 |  |  | $ | — |  |  | $ | — |  |  | $ | 220,151 |
| As of January 31, 2017
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 10,565 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,565 |
Investments: |  |  |  |  |  |  |  |  |  |
Asset-backed securities | 1,538 |  |  | — |  |  | — |  |  | 1,538 |
Corporate debt securities | 12,842 |  |  | 13 |  |  | (3 | ) |  | 12,852 |
Total short-term investments | $ | 14,380 |  |  | $ | 13 |  |  | $ | (3 | ) |  | $ | 14,390 |
Total | $ | 24,945 |  |  | $ | 13 |  |  | $ | (3 | ) |  | $ | 24,955 |
All short-term investments were designated as available-for-sale securities as of April 30, 2017 and January 31, 2017. The Company had one and five short-term investments in unrealized loss positions as of April 30, 2017 and January 31, 2017, respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the three months ended April 30, 2017 or 2016. For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) it has the intention to sell any of these investments and (ii) whether it is not more likely than not that it will be required to sell any of these available-for-sale debt securities before recovery of the entire amortized cost basis. Based on this evaluation, the Company determined that there were no other-than-temporary impairments associated with short-term investments as of April 30, 2017 and January 31, 2017. The following tables present the contractual maturities of the Company’s short-term investments as of April 30, 2017 and January 31, 2017 (in thousands):
| As of April 30, 2017
| (unaudited)
| Amortized Cost |  | Estimated Fair Value
Due within one year | $ | 2,500 |  |  | $ | 2,500 |
Due between one to five years | — |  |  | — |
| $ | 2,500 |  |  | $ | 2,500 |
| As of January 31, 2017
| Amortized Cost |  | Estimated Fair Value
Due within one year | $ | 12,842 |  |  | $ | 12,852 |
Due between one to five years | 1,538 |  |  | 1,538 |
| $ | 14,380 |  |  | $ | 14,390 |

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 + Details
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