Other Long-Term Liabilities and Deferred Credits - Schedule of Other Long-Term Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Other long-term liabilities and deferred credits		$ 500	$ 800
Royalties Payable [Member]
Other long-term liabilities and deferred credits	[1]	500	500
UNC Purchase Contract [Member]
Other long-term liabilities and deferred credits	[2]		$ 300

[1] Royalties payable were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.

[2] On December 21, 2016, the Company returned the data to UNC. Pursuant to the terms of the Data Purchase Agreement, upon return of the data to UNC, the Data Purchase Agreement would be canceled and the Company would be released from any unpaid obligation. As a result, the Company was released from its $0.4 million liability and recorded the amount as a reduction in land holding and maintenance costs at its Cebolleta project.