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Cash Equivalents and Short-Term Investments | 6 Months Ended
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Jul. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Short-Term Investments | Cash Equivalents and Short-Term Investments The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash equivalents and short-term investments as of July 31, 2018 and January 31, 2018 were as follows (in thousands):
| As of July 31, 2018
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
| (unaudited)
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 155,347 |  |  | $ | — |  |  | $ | — |  |  | $ | 155,347 |
Commercial paper | 12,237 |  |  | — |  |  | — |  |  | 12,237 |
Total cash equivalents | $ | 167,584 |  |  | $ | — |  |  | $ | — |  |  | $ | 167,584 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | 56,191 |  |  | $ | — |  |  | $ | — |  |  | $ | 56,191 |
U.S. treasury securities | 248,081 |  |  | — |  |  | (217 | ) |  | 247,864 |
Corporate debt securities | 39,352 |  |  | 6 |  |  | (39 | ) |  | 39,319 |
Total short-term investments | 343,624 |  |  | 6 |  |  | (256 | ) |  | 343,374 |
Total | $ | 511,208 |  |  | $ | 6 |  |  | $ | (256 | ) |  | $ | 510,958 |
| As of January 31, 2018
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 90,770 |  |  | $ | — |  |  | $ | — |  |  | $ | 90,770 |
Total cash equivalents | $ | 90,770 |  |  | $ | — |  |  | $ | — |  |  | $ | 90,770 |
Short-term investments: |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | 15,946 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,946 |
U.S. treasury securities | 61,896 |  |  | — |  |  | (158 | ) |  | 61,738 |
Corporate debt securities | 24,125 |  |  | — |  |  | (44 | ) |  | 24,081 |
Total short-term investments | 101,967 |  |  | — |  |  | (202 | ) |  | 101,765 |
Total | $ | 192,737 |  |  | $ | — |  |  | $ | (202 | ) |  | $ | 192,535 |
All short-term investments were designated as available-for-sale securities as of July 31, 2018 and January 31, 2018. The following tables present the contractual maturities of the Company’s short-term investments as of July 31, 2018 and January 31, 2018 (in thousands):
| As of July 31, 2018 |  | As of January 31, 2018
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
| (unaudited) |  |  |  |
Due within one year | $ | 328,694 |  |  | $ | 328,460 |  |  | $ | 93,421 |  |  | $ | 93,237 |
Due between one to five years | 14,930 |  |  | 14,914 |  |  | 8,546 |  |  | 8,528 |
| $ | 343,624 |  |  | $ | 343,374 |  |  | $ | 101,967 |  |  | $ | 101,765 |
The Company had 53 and 23 short-term investments in unrealized loss positions as of July 31, 2018 and January 31, 2018, respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the three and six months ended July 31, 2018 or 2017. For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) the Company has the intention to sell any of these investments and (ii) it is not more likely than not that the Company 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 July 31, 2018 and January 31, 2018.

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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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