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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [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 December 31, 2019 and 2018 by level within the fair value hierarchy (in thousands): 
 December 31, 2019
Level 1Level 2Level 3Total
Money market funds$71,248  $—  $—  $71,248  

 
December 31, 2018
Level 1
Level 2
Level 3
Total
Money market funds$31,225  $—  $—  $31,225  
Common shares of CO2 Solutions588  

—  —  588  
Total
$31,813  $—  $—  $31,813