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Other Long-Term Liabilities and Deferred Credits (Tables) | 12 Months Ended
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Dec. 31, 2014
Other Liabilities Disclosure [Abstract] |
Schedule of Other Long-Term Liabilities and Deferred Credits | Other long-term liabilities and deferred credits on the balance sheet consisted of:
|  | December 31, |
|  | 2014 |  |  | 2013 |
Royalties payable(1) |  | $ | 500 |  |  | $ | 500 |
Crownpoint property(1) |  |  | 450 |  |  |  | 450 |
GE purchase contract(2) |  |  | — |  |  |  | 400 |
|  | $ | 950 |  |  | $ | 1,350 |
| (1) | Royalties payable and Crownpoint property liability were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.
| (2) | Balance is due on August 1, 2015 and has been reclassified to short-term accrued liabilities as of December 31, 2014.

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