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Cash Equivalents and Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Cash Equivalents and Marketable Securities [Abstract]  
Schedule of cash equivalents and marketable securities
Cash equivalents and marketable securities classified as available-for-sale at September 30, 2017 and at December 31, 2016 consisted of the following (in thousands):
 
September 30, 2017
 
Adjusted Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated
Fair Value
Money market funds (1)
$
6,262

 
$
—

 
$
—

 
$
6,262

Common shares of CO2 Solutions (2)
563

 
600

 
—

 
1,163

Total
$
6,825

 
$
600

 
$
—

 
$
7,425


 
December 31, 2016
 
Adjusted Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated
Fair Value
Money market funds (1)
$
11,172

 
$
—

 
$
—

 
$
11,172

Common shares of CO2 Solutions (2)
563

 
579

 
—

 
1,142

Total
$
11,735

 
$
579

 
$
—

 
$
12,314


(1) Money market funds are classified in cash and cash equivalents on our condensed consolidated balance sheets.
(2) Common shares of CO2 Solutions are classified in marketable securities on our condensed consolidated balance sheets.