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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments in privately-held companies [Abstract]  
Equity Securities without Readily Determinable Fair Value The following table summarizes the activity related to our investments in privately-held companies held as of June 30, 2020 and December 31, 2019 (in thousands):
 
 
June 30, 2020
 
December 31, 2019
Cost of investment
 
$
3,000

 
$
3,000

Cumulative impairment
 
—

 
—

Cumulative upward adjustment
 
1,150

 
1,150

Carrying amount of investment
 
$
4,150

 
$
4,150