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Fair Value Measurements (Tables)

12 Months Ended

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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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