Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Financial Assets measured at Fair Value on a Recurring Basis (Details)

v3.3.1.900
Fair Value Measurements - Financial Assets measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis $ 12,669 $ 15,290
Level 1    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 11,120 14,602
Level 2    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 1,549 688
Level 3    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 0 0
Money Market Funds    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 11,120 14,602
Money Market Funds | Level 1    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 11,120 14,602
Money Market Funds | Level 2    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 0 0
Money Market Funds | Level 3    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 0 0
Common shares of CO2 Solutions    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 1,549 688
Common shares of CO2 Solutions | Level 1    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 0 0
Common shares of CO2 Solutions | Level 2    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis 1,549 688
Common shares of CO2 Solutions | Level 3    
Summary of financial instruments measured at fair value on a recurring basis    
Total financial assets measured at fair value on a recurring basis $ 0 $ 0