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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]  
Summary of financial instruments measured at fair value on a recurring basis
The following tables present the financial instruments that were measured at fair value on a recurring basis at June 30, 2018 and December 31, 2017 by level within the fair value hierarchy (in thousands):
 
June 30, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds (1)
$
30,913

 
$
—

 
$
—

 
$
30,913

Common shares of CO2 Solutions (2)
—

 
676

 
—

 
676

Total
$
30,913

 
$
676

 
$
—

 
$
31,589


 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds (1)
$
6,778

 
$
—

 
$
—

 
$
6,778

Common shares of CO2 Solutions (2)
—

 
671

 
—

 
671

Total
$
6,778

 
$
671

 
$
—

 
$
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.