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Fair Value Measurements
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present the financial instruments that were measured at fair value on a recurring basis at June 30, 2019 and December 31, 2018 by level within the fair value hierarchy (in thousands):
 
June 30, 2019
 
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds
$
73,167

 
$
—

 
$
—

 
$
73,167

Common shares of CO2 Solutions
419

 
—

 
—

 
419

Total
$
73,586

 
$
—

 
$
—

 
$
73,586

 
December 31, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds
$
31,225

 
$
—

 
$
—

 
$
31,225

Common shares of CO2 Solutions
588

 
—

 
—

 
588

Total
$
31,813

 
$
—

 
$
—

 
$
31,813



We determine the fair value of Level 1 assets using quoted prices in active markets for identical assets. We estimated the fair value of our investment in 10,000,000 common shares of CO2 Solutions using the market value of common shares as determined by trading on the TSX Venture Exchange, and we classified our investment in CO2 Solutions within the fair value hierarchy as Level 1 at June 30, 2019 and December 31, 2018, respectively, using the quoted prices in an active market to determine their fair value.