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Cash Equivalents and Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Cash Equivalents and Marketable Securities [Abstract]  
Schedule of cash equivalents and marketable securities
Cash equivalents and marketable securities at June 30, 2018 and at December 31, 2017 consisted of the following (in thousands):
 
June 30, 2018
 
Adjusted Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated
Fair Value
Money market funds (1)
$
30,913

 
$
—

 
$
—

 
$
30,913

Common shares of CO2 Solutions (2)
563

 
113

 
—

 
676

Total
$
31,476

 
$
113

 
$
—

 
$
31,589


 
December 31, 2017
 
Adjusted Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated
Fair Value
Money market funds (1)
$
6,778

 
$
—

 
$
—

 
$
6,778

Common shares of CO2 Solutions (2)
563

 
108

 
—

 
671

Total
$
7,341

 
$
108

 
$
—

 
$
7,449


    
(1) Money market funds are classified in cash and cash equivalents on our unaudited condensed consolidated balance sheets.
(2) Common shares of CO2 Solutions are classified as marketable securities, and included in non-current assets on our unaudited condensed consolidated balance sheets.