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Note 5 - Stockholders' Equity - Allocation of the Recognized Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Research and Development Expense [Member]
Share-based compensation expense	$ 927	$ 715	$ 2,652	$ 2,423
General and Administrative Expense [Member]
Share-based compensation expense	1,894	1,045	5,860	3,386
Share-based compensation expense	$ 2,821	$ 1,760	$ 8,512	$ 5,809
Impact on basic and diluted net loss per share (in dollars per share)	$ 0.08	$ 0.06	$ 0.27	$ 0.23

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- Definition

Impact on basic and diluted net loss per common share in dollars per shar

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



-Section S99



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