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Fair Value Measurements (Tables) | 12 Months Ended
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Aug. 03, 2019
Fair Value Disclosures [Abstract] |
Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-for-sale Investments | The following table sets forth the amortized cost, gross unrealized gains, gross unrealized losses and fair values of our short-term and long-term investments accounted for as available-for-sale securities as of August 3, 2019:
|  | August 3, 2019
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Financial Assets: |  |  |  |  |  |  |  |
Investments: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 49,807 |  |  | $ | 100 |  |  | $ | — |  |  | $ | 49,907 |
Commercial paper |  | 29,761 |  |  | — |  |  | — |  |  | 29,761 |
Asset-backed securities |  | 42,587 |  |  | 145 |  |  | — |  |  | 42,732 |
Corporate bonds |  | 73,969 |  |  | 279 |  |  | — |  |  | 74,248 |
Total |  | $ | 196,124 |  |  | $ | 524 |  |  | $ | — |  |  | $ | 196,648 |
Schedule of Fair Value of Available-for-sale Securities By Contractual Maturity | The following table sets forth the fair value of available-for-sale securities by contractual maturity as of August 3, 2019:
|  | August 3, 2019
(in thousands) |  | One Year or Less |  | Over One Year Through Five Years |  | Over Five Years |  | Total
Financial Assets: |  |  |  |  |  |  |  |
Investments: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 44,772 |  |  | $ | 5,135 |  |  | $ | — |  |  | $ | 49,907 |
Commercial paper |  | 29,761 |  |  | — |  |  | — |  |  | 29,761 |
Asset-backed securities |  | 5,412 |  |  | 37,320 |  |  | — |  |  | 42,732 |
Corporate bonds |  | 63,331 |  |  | 10,917 |  |  | — |  |  | 74,248 |
Total |  | $ | 143,276 |  |  | $ | 53,372 |  |  | $ | — |  |  | $ | 196,648 |
Schedule of Short-term and Long-term Investments Accounted for as Available-for-sale Measured at Fair Value on Recurring Basis | The following table sets forth our cash equivalents, and short-term and long-term investments accounted for as available-for-sale securities that were measured at fair value on a recurring basis based on the fair value hierarchy as of August 3, 2019:
|  | August 3, 2019
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 6,427 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,427 |
Commercial paper |  | — |  |  | 11,970 |  |  | — |  |  | 11,970 |
Investments: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 49,907 |  |  | — |  |  | — |  |  | 49,907 |
Commercial paper |  | — |  |  | 29,761 |  |  | — |  |  | 29,761 |
Asset-backed securities |  | — |  |  | 42,732 |  |  | — |  |  | 42,732 |
Corporate bonds |  | — |  |  | 74,248 |  |  | — |  |  | 74,248 |
Total |  | $ | 56,334 |  |  | $ | 158,711 |  |  | $ | — |  |  | $ | 215,045 |
Schedule of Changes in Fair Value of Preferred Stock Warrant Liability | The following table sets forth a summary of the changes in the fair value of the preferred stock warrant liability for the fiscal year ended July 28, 2018:
(in thousands) |  | For the Fiscal Year Ended July 28, 2018
Balance at July 29, 2017 |  | $ | 26,679 |
Change in fair value |  | (10,685 | )
Reclassification of warrant liability to additional paid-in capital upon the initial public offering |  | (15,994 | )
Balance at July 28, 2018 |  | $ | — |
Schedule of Key Assumptions Used in the Black-Scholes Option-Pricing Model for Valuation of Preferred Stock Warrant Liability | The key assumptions used in the Black-Scholes option-pricing model for the valuation of the preferred stock warrant liability upon remeasurement were as follows:
|  | July 29, 2017
Expected term (in years) |  | 2.0 |
Fair value of underlying shares |  | $ | 25.09 |
Volatility |  | 43.8 | %
Risk free interest rate |  | 1.3 | %
Dividend yield |  | — | %

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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