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Fair Value Measurements
 12 Months Ended
Dec. 31, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [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 December 31, 2017 and 2016 by level within the fair value hierarchy (in thousands): 
 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds
$
6,778

 
$
—

 
$
—

 
$
6,778

Common shares of CO2 Solutions
—

 
671

 
—

 
671

Total
$
6,778

 
$
671

 
$
—

 
$
7,449

 
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds
$
11,172


$
—

 
$
—


$
11,172

Common shares of CO2 Solutions
—


1,142

 
—

 
1,142

Total
$
11,172

 
$
1,142

 
$
—

 
$
12,314


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 as Level 2 assets due to the volatile and low trading volume. There were no transfers between Level 1 and Level 2 securities in the periods presented. (See also “Note 5 - Cash Equivalents and Marketable Securities”.)