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Cash and Cash Equivalents
12 Months Ended
Dec. 31, 2019
Cash and Cash Equivalents  
Cash and Cash Equivalents

4.    Cash and Cash Equivalents

The following is a summary of cash and cash equivalents at December 31, 2018 and 2019 (in thousands):

 

 

 

 

 

 

 

 

 

 

December 31, 

 

    

2018

    

2019

Cash

 

$

816

 

$

743

Investments with original maturity of less than three months at the time of purchase

 

 

16,688

 

 

11,142

Total cash and cash equivalents

 

$

17,504

 

$

11,885

 

Investments with original maturity of less than three months at time of purchase are made up of money market funds and commercial paper.