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Fair value of financial assets and liabilities
9 Months Ended
Sep. 30, 2021
Fair value of financial assets and liabilities  
Fair value of financial assets and liabilities

3. Fair value of financial assets and liabilities

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy used to determine such fair values (in thousands):

    

Fair value measurements as of September 30, 2021

    

Level 1

    

Level 2

    

Level 3

    

Total

Assets

  

 

  

 

  

 

  

Cash equivalents

$

212,833

$

$

$

212,833

$

212,833

$

$

$

212,833

    

Fair value measurements at December 31, 2020

    

Level 1

    

Level 2

    

Level 3

    

Total

Assets

  

 

  

 

  

 

  

Cash equivalents

$

23,456

$

$

$

23,456

Short-term investments

 

14,998

 

 

 

14,998

$

38,454

$

$

$

38,454

Liabilities

 

  

 

  

 

  

 

Preferred stock warrant liability

$

$

$

4,117

$

4,117

$

$

$

4,117

$

4,117

During the three and nine months ended September 30, 2021 and 2020, respectively, there were no transfers between Level 1, Level 2 and Level 3.

Valuation of short-term investments

Short-term investments, which consisted of U.S. Treasury bonds were valued by the Company using quoted prices in active markets for similar securities, which represents a Level 1 measurement within the fair value hierarchy.

Valuation of preferred stock warrant liability

The warrant liability was related to the warrants (the “Warrants”) to purchase shares of the Company’s Series A1, B1, and C1 redeemable convertible preferred stock (see Note 11). The fair value of the warrant liability was determined based on inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy.

The Company used the Black-Scholes option-pricing model, which incorporates assumptions and estimates, to value the warrant liability. Key estimates and assumptions impacting the fair value measurement include (i) the fair value per share of the underlying shares of applicable series of redeemable convertible preferred stock issuable upon exercise of the Warrants, (ii) the remaining contractual term of the Warrants, (iii) the risk-free interest rate, (iv) the expected dividend yield and (iv) expected volatility of the price of the underlying applicable series of redeemable convertible preferred stock. The Company estimated the fair value per share of the underlying applicable series of redeemable convertible preferred stock based, in part, on the results of third-party valuations and additional factors deemed relevant. The risk-free interest rate was determined by reference to the U.S. Treasury yield curve for time periods approximately equal to the remaining contractual term of the Warrant. The Company estimated a zero expected dividend yield based on the fact that the Company has never paid or declared dividends and does not intend to do so in the foreseeable future. As the Company has historically been a private company and lacks company-specific historical and implied volatility information of its stock, the expected stock volatility was based on the historical volatility of publicly traded peer companies for a term equal to the remaining contractual term of the Warrant.

In connection with the IPO, all of the Company’s outstanding preferred stock warrants were automatically converted to Class A common stock warrants. The Company performed a final fair value assessment of these warrants as of the date of its IPO which resulted in a charge of $8.2 million that was recorded within other income (expense) in the Company’s condensed consolidated statement of operations. The Company determined the conversion to Class A common stock warrants resulted in equity classification of the Class A common stock warrants and reclassified the fair value of the preferred stock warrant liability as of the IPO date into stockholders’ equity (see Note 12).

The table below quantifies the weighted average of the unobservable inputs used to fair value the preferred stock warrant liability prior to their conversion into common stock warrants:

    

Three Months Ended September 30, 

 

    

Nine Months Ended September 30, 

 

    

2021

    

2020

 

    

2021

    

2020

 

Fair value of Series A1 preferred stock

$

4.00

$

0.39

$

3.01

$

0.45

Fair value of Series B1 preferred stock

$

4.00

$

1.17

$

3.26

$

1.13

Fair value of Series C1 preferred stock

$

4.00

$

1.15

$

3.30

$

1.15

Remaining contractual term (in years)

 

6.6

 

7.4

 

6.8

 

7.7

Risk-free interest rate

 

1.0

%  

 

0.6

%

 

1.2

%  

 

0.6

%

Expected dividend yield

 

%  

 

%

 

%  

 

%

Expected volatility

 

42.2

%  

 

40.3

%

 

42.0

%  

 

39.3

%

The following table provides a rollforward of the aggregate fair values of the Company’s preferred stock warrant liability, for which fair values are determined using Level 3 inputs (in thousands):

    

Three Months Ended September 30, 

    

Nine Months Ended September 30, 

    

2021

    

2020

    

2021

    

2020

Balance, beginning of period

$

15,600

$

3,499

$

4,117

$

3,396

Initial fair value of Series C1 preferred stock warrants

652

Change in fair value of preferred stock warrants

 

8,160

 

 

19,643

 

(549)

Conversion of preferred stock warrants to common stock warrants

 

(23,760)

 

 

(23,760)

 

Balance, end of period

$

$

3,499

$

$

3,499