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Note 14 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of 2013 Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Results of 2013 Operations [Abstract]
Total revenue	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0			$ 646
Operating expenses	13,832	12,664	15,209	12,752	8,628	6,054	4,380	4,769	54,457	23,831	11,708
Interest and other expense, net	(212)	(209)	(204)	(201)	(197)	(195)	(146)	(61)	(826)	(599)	(373)
Net loss	$ (14,044)	$ (12,873)	$ (15,413)	$ (12,953)	$ (7,737)	$ (6,121)	$ (4,569)	$ (4,921)	$ (55,283)	$ (23,348)	$ (11,814)
Net loss (in Dollars per share)	$ (0.75)	$ (0.84)	$ (1.01)	$ (0.85)	$ (0.51)	$ (0.45)	$ (0.46)	$ (0.49)	$ (3.42)	$ (1.91)	$ (1.96)

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Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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