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Fair Value Measurements
12 Months Ended
Aug. 03, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
We disclose and recognize the fair value of our assets and liabilities using a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The guidance establishes three levels of the fair value hierarchy as follows:
Level 1: Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date;
Level 2: Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities; and
Level 3: Unobservable inputs that are significant to the measurement of the fair value of the assets or liabilities that are supported by little or no market data.
Our financial instruments consist of cash and cash equivalents, short-term and long-term investments, accounts payable, accrued liabilities, and, prior to our IPO, the preferred stock warrant liability. At August 3, 2019, and July 28, 2018, the carrying values of cash and cash equivalents, accounts payable, and accrued liabilities approximated fair value due to their short-term maturities. In November 2017, in connection with our IPO, all outstanding preferred stock warrants were automatically exercised into shares of Class B common stock. As a result, we remeasured and reclassified the preferred stock warrant liability to additional paid-in capital upon the closing of our IPO.
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

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


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


As of July 28, 2018, the Company did not have any financial instruments measured at fair value.
There were no transfers of financial assets or liabilities into or out of Level 1, Level 2, or Level 3 for the fiscal years ended August 3, 2019, and July 28, 2018.
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
 
$


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
 
%

Generally, increases or decreases in the fair value of the underlying convertible preferred stock would result in a directionally similar impact in the fair value measurement of the associated warrant liability.
See Note 6, Preferred Stock Warrant Liability, for more details on our preferred stock warrants.