XML 32 R19.htm IDEA: XBRL DOCUMENT v3.22.0.1
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.