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Marketable Securities and Fair Value Measurements
6 Months Ended
Jun. 30, 2021
Marketable Securities and Fair Value Measurements [Abstract]  
Marketable Securities and Fair Value Measurements

3. Marketable Securities and Fair Value Measurements

The following tables present our marketable securities by security type:

As of June 30, 2021

    

    

Gross

    

Gross

    

Estimated

Amortized

Unrealized

Unrealized

Fair

(in thousands)

Cost

Gains

Losses

Value

U.S. treasury securities

$

33,117

$

4

$

$

33,121

As of December 31, 2020

    

    

Gross

    

Gross

    

Amortized

Unrealized

Unrealized

Fair

(in thousands)

Cost

Gains

Losses

Value

U.S. treasury securities

$

129,446

$

9

$

(4)

$

129,451

Commercial paper

 

52,441

 

 

 

52,441

Corporate debt securities

 

17,542

 

4

 

 

17,546

Total

$

199,429

$

13

$

(4)

$

199,438

As of June 30, 2021 and December 31, 2020, marketable securities consisted of investments that mature within one year.

The following tables present our assets that are measured at fair value on a recurring basis and indicate the level within the fair value hierarchy of the valuation techniques that we utilized to determine such fair value:

    

Fair Value Measurements at June 30, 2021 Using:

(in thousands)

Level 1

Level 2

Level 3

Total

Cash equivalents:

 

  

 

  

 

  

 

  

Money market funds

$

226,378

$

$

$

226,378

Marketable securities:

 

  

 

  

 

  

 

  

U.S. treasury securities

 

 

33,121

 

 

33,121

    

Fair Value Measurements at December 31, 2020 Using:

(in thousands)

    

Level 1

    

Level 2

    

Level 3

    

Total

Cash equivalents:

  

 

  

 

  

 

  

Money market funds

$

63,827

$

$

$

63,827

Marketable securities:

U.S. treasury securities

129,451

129,451

Commercial paper

52,441

52,441

Corporate debt securities

17,546

17,546

Total

$

63,827

$

199,438

$

$

263,265

Money market funds were valued based on quoted market prices, which represent a Level 1 measurement within the fair value hierarchy. Our marketable securities, which have consisted of U.S. treasury securities, commercial paper and corporate debt securities were valued using quoted prices in active markets for similar securities, which represent a Level 2 measurement within the fair value hierarchy.