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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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