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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Measurements  
Fair Value of Assets and Liabilities Measured on Recurring Basis

    

2019

    

2018

Quoted prices in active markets (Level 1):

Cash equivalents and money market funds

 

$

3,527

 

$

70

Significant other observable inputs (Level 2):

Available-for-sale securities

 

350

288

Significant unobservable inputs (Level 3):

Redeemable preferred stock

 

49

 

66

Total Assets

 

$

3,926

$

424