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Fair Value Measurements
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements

11. Fair Value Measurements

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2021 and 2020 and by level within the fair value hierarchy:

Fair value measurement as of December 31, 2021:

Quoted prices in

Significant other

Significant

Financial assets

active markets for

observable

unobservable

identical assets

inputs

inputs

Type of Instrument

    

Total

    

(Level 1)

    

(Level 2)

    

(Level 3)

Cash and cash equivalents:

 

  

 

  

 

  

 

  

Money market funds and checking accounts

$

13,453

$

13,453

$

$

Available-for-sale marketable securities:

 

 

  

 

 

U.S. Treasury securities

 

11,570

 

 

11,570

 

U.S. government agency obligations

 

16,975

 

 

16,975

 

Corporate bonds

 

66,324

 

 

66,324

 

Commercial paper

 

106,888

 

 

106,888

 

Municipal bonds

 

21,579

 

 

21,579

 

Restricted cash:

 

 

  

 

 

Commercial money market account

 

408

 

408

 

 

Total financial assets

$

237,197

$

13,861

$

223,336

$

Fair value measurement as of December 31, 2020:

Quoted prices in

Significant other

Significant

Financial assets

active markets for

observable

unobservable

identical assets

inputs

inputs

Type of Instrument

    

Total

    

(Level 1)

    

(Level 2)

    

(Level 3)

Cash and cash equivalents:

 

  

 

  

 

  

 

  

Money market funds and checking accounts

$

31,683

$

31,683

$

$

Available-for-sale marketable securities:

 

  

 

  

 

  

 

  

U.S. Treasury securities

20,750

20,750

U.S. government agency obligations

 

22,128

 

 

22,128

 

Corporate bonds

 

49,118

 

 

49,118

 

Commercial paper

 

116,127

 

 

116,127

 

Municipal bonds

11,684

11,684

Restricted cash:

 

  

 

  

 

  

 

  

Commercial money market account

 

408

 

408

 

 

Total financial assets

$

251,898

$

32,091

$

219,807

$

There were no purchases, sales or maturities of Level 3 financial assets and no unrealized gains or losses related to Level 3 available-for-sale marketable securities for the years ended December 31, 2021, 2020 and 2019. There were no transfers of financial assets between Levels 1, 2, or 3 classifications during the years ended December 31, 2021 and 2020.