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Cash Equivalents and Short-Term Investments - Schedule of Unrealized Position (Details) - USD ($) $ in Thousands | Jan. 31, 2020 | Jul. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | $ 34,437 | $ 56,548
Less than 12 months, unrealized losses | (21) | (62)
Greater than 12 months, fair value | 21,121 | 18,356
Greater than 12 months, unrealized losses | (7) | (16)
Total fair value | 55,558 | 74,904
Total unrealized losses | (28) | (78)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 28,149 | 36,550
Less than 12 months, unrealized losses | (17) | (37)
Greater than 12 months, fair value | 20,121 | 9,992
Greater than 12 months, unrealized losses | (6) | (13)
Total fair value | 48,270 | 46,542
Total unrealized losses | (23) | (50)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 6,288 | 14,279
Less than 12 months, unrealized losses | (4) | (16)
Greater than 12 months, fair value | 1,000 | 8,364
Greater than 12 months, unrealized losses | (1) | (3)
Total fair value | 7,288 | 22,643
Total unrealized losses | $ (5) | (19)
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value |  | 5,719
Less than 12 months, unrealized losses |  | (9)
Greater than 12 months, fair value |  | 0
Greater than 12 months, unrealized losses |  | 0
Total fair value |  | 5,719
Total unrealized losses |  | $ (9)

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