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Cash Equivalents and Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Cash Equivalents and Marketable Securities [Abstract]  
Schedule of cash equivalents and marketable securities
Cash equivalents and marketable securities at March 31, 2019 and at December 31, 2018 consisted of the following (in thousands):
 
March 31, 2019
 
Adjusted Cost
 
Gross Unrealized
Gains (3)
 
Gross Unrealized
Losses(3)
 
Estimated
Fair Value
Money market funds (1)
$
28,001

 
$
—

 
$
—

 
$
28,001

Common shares of CO2 Solutions (2)
563

 
—

 
(79
)
 
484

Total
$
28,564

 
$
—

 
$
(79
)
 
$
28,485


 
December 31, 2018
 
Adjusted Cost
 
Gross Unrealized
Gains(3)
 
Gross Unrealized
Losses(3)
 
Estimated
Fair Value
Money market funds (1)
$
31,225

 
$
—

 
$
—

 
$
31,225

Common shares of CO2 Solutions (2)
563

 
25

 
—

 
588

Total
$
31,788

 
$
25

 
$
—

 
$
31,813


    
(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 in equity securities on our unaudited condensed consolidated balance sheets.
(3) As a result of adopting ASU 2016-01, in 2018 and thereafter gross unrealized gains and gross unrealized losses related to our investment in CO2 Solutions were recognized in other expense, in our unaudited condensed consolidated statements of operations.