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Investment in American Shale Oil, LLC (Details 2) (AMSO, LLC [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
AMSO, LLC [Member] |  |  |  |
Operating expenses: |  |  |  |
General and administrative | $ 111 | $ 124 | $ 234 | $ 273
Research and development | 2,534 | 2,219 | 4,046 | 5,297
Loss from operations | 2,645 | 2,343 | 4,280 | 5,570
Other income |  | 41 |  | 41
Net loss | $ (2,645) | $ (2,302) | $ (4,280) | $ (5,529)

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