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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Measurements  
Fair Value of Assets and Liabilities Measured on Recurring Basis

    

2020

    

2019

Quoted prices in active markets (Level 1):

Cash equivalents and money market funds

 

$

530

 

$

3,527

Significant other observable inputs (Level 2):

Available-for-sale securities

 

390

350

Significant unobservable inputs (Level 3):

Redeemable preferred stock

 

49

 

49

Total Assets

 

$

969

$

3,926