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Cash Equivalents and Short-Term Investments | 6 Months Ended
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Jan. 31, 2020
Cash and Cash Equivalents [Abstract] |
Cash Equivalents and Short-Term Investments | Cash Equivalents and Short-Term Investments Cash equivalents and short-term investments consisted of the following as of January 31, 2020:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (in thousands) |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 42,374 |  |  | $ | — |  |  | $ | — |  |  | $ | 42,374 |
U.S. government agency securities | 1,500 |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 43,874 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,874 |
Short-term investments: |  |  |  |  |  |  |
U.S. treasury securities | $ | 71,914 |  |  | $ | 254 |  |  | $ | — |  |  | $ | 72,168 |
U.S. government agency securities | 112,956 |  |  | 47 |  |  | (23) |  |  | 112,980 |
Corporate debt securities | 122,903 |  |  | 334 |  |  | (5) |  |  | 123,232 |
Total | $ | 307,773 |  |  | $ | 635 |  |  | $ | (28) |  |  | $ | 308,380 |
Total cash equivalents and short-term investments | $ | 351,647 |  |  | $ | 635 |  |  | $ | (28) |  |  | $ | 352,254 |
Cash equivalents and short-term investments consisted of the following as of July 31, 2019:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Cash equivalents: | (in thousands) |  |  |  |  |  |
Money market funds | $ | 55,036 |  |  | $ | — |  |  | $ | — |  |  | $ | 55,036 |
Short-term investments: |  |  |  |  |  |  |
U.S. treasury securities | $ | 125,042 |  |  | $ | 248 |  |  | $ | (9) |  |  | $ | 125,281 |
U.S. government agency securities | 64,689 |  |  | 7 |  |  | (50) |  |  | 64,646 |
Corporate debt securities | 96,047 |  |  | 207 |  |  | (19) |  |  | 96,235 |
Total | $ | 285,778 |  |  | $ | 462 |  |  | $ | (78) |  |  | $ | 286,162 |
Total cash equivalents and short-term investments | $ | 340,814 |  |  | $ | 462 |  |  | $ | (78) |  |  | $ | 341,198 |
The amortized cost and fair value of our short-term investments based on their stated maturities consisted of the following as of January 31, 2020:
| Amortized Cost |  | Fair Value
| (in thousands) |  |
Due within one year | $ | 173,815 |  |  | $ | 174,232 |
Due between one and two years | 133,958 |  |  | 134,148 |
Total | $ | 307,773 |  |  | $ | 308,380 |
Short-term investments that were in an unrealized loss position as of January 31, 2020 consisted of the following:
| Less than 12 Months |  |  |  | Greater than 12 Months |  |  |  | Total |  |
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (in thousands) |  |  |  |  |  |  |  |  |  |
U.S. government agency securities | $ | 28,149 |  |  | $ | (17) |  |  | $ | 20,121 |  |  | $ | (6) |  |  | $ | 48,270 |  |  | $ | (23) |
Corporate debt securities | 6,288 |  |  | (4) |  |  | 1,000 |  |  | (1) |  |  | 7,288 |  |  | (5) |
Total | $ | 34,437 |  |  | $ | (21) |  |  | $ | 21,121 |  |  | $ | (7) |  |  | $ | 55,558 |  |  | $ | (28) |
Unrealized losses of the above securities were primarily attributable to changes in interest rates. Short-term investments that were in an unrealized loss position as of July 31, 2019 consisted of the following:
| Less than 12 Months |  |  |  | Greater than 12 Months |  |  |  | Total |  |
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (in thousands) |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | 5,719 |  |  | $ | (9) |  |  | $ | — |  |  | $ | — |  |  | $ | 5,719 |  |  | $ | (9) |
U.S. government agency securities | 36,550 |  |  | (37) |  |  | 9,992 |  |  | (13) |  |  | 46,542 |  |  | (50) |
Corporate debt securities | 14,279 |  |  | (16) |  |  | 8,364 |  |  | (3) |  |  | 22,643 |  |  | (19) |
Total | $ | 56,548 |  |  | $ | (62) |  |  | $ | 18,356 |  |  | $ | (16) |  |  | $ | 74,904 |  |  | $ | (78) |
We review the individual securities that have unrealized losses in our short-term investment portfolio on a regular basis to evaluate whether or not any security has experienced an other-than-temporary decline in fair value. We evaluate, among others, whether we have the intention to sell any of these investments and whether it is not more likely than not that we will be required to sell any of them before recovery of the amortized cost basis. Based on this evaluation, we determined that there were no other-than-temporary impairments associated with our short-term investments as of January 31, 2020 and July 31, 2019.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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