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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Summary of financial instruments measured at fair value on a recurring basis
Cash and cash equivalents	$ 47,322	$ 53,039	$ 24,300
Common shares of CO2 Solutions	484	588
Total	28,485	31,813
Available-for-sale Securities [Member]
Summary of financial instruments measured at fair value on a recurring basis
Common shares of CO2 Solutions	484	588
Money Market Funds [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash and cash equivalents	28,001	31,225
Level 1 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Total	28,485	31,813
Level 1 [Member] \| Available-for-sale Securities [Member]
Summary of financial instruments measured at fair value on a recurring basis
Common shares of CO2 Solutions	484	588
Level 1 [Member] \| Money Market Funds [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash and cash equivalents	28,001	31,225
Level 2 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Total	0	0
Level 2 [Member] \| Available-for-sale Securities [Member]
Summary of financial instruments measured at fair value on a recurring basis
Common shares of CO2 Solutions	$ 0	0
Level 2 [Member] \| Common Shares of Co Two Solution [Member]
Summary of financial instruments measured at fair value on a recurring basis
Investment owned (in shares)	10,000,000
Level 2 [Member] \| Money Market Funds [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash and cash equivalents	$ 0	0
Level 3 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Total	0	0
Level 3 [Member] \| Available-for-sale Securities [Member]
Summary of financial instruments measured at fair value on a recurring basis
Common shares of CO2 Solutions	0	0
Level 3 [Member] \| Money Market Funds [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash and cash equivalents	$ 0	$ 0