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Investment in American Shale Oil, LLC (Details 2) (AMSO, LLC [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
AMSO, LLC [Member]
Operating expenses:
General and administrative	$ 162	$ 132	$ 435	$ 389
Research and development	1,758	1,320	7,055	6,046
Loss from operations	1,920	1,452	7,490	6,435
Other income			41
Net loss	$ (1,920)	$ (1,452)	$ (7,449)	$ (6,435)

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