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Note 5 - Stockholders' Equity - Allocation of the Recognized Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Research and Development Expense [Member]
Share-based compensation expense	$ 919	$ 446	$ 1,725	$ 1,708
General and Administrative Expense [Member]
Share-based compensation expense	2,222	634	3,966	2,341
Share-based compensation expense	$ 3,141	$ 1,080	$ 5,691	$ 4,049
Impact on basic and diluted net loss per share (in dollars per share)	$ 0.10	$ 0.04	$ 0.19	$ 0.17

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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



-Topic 718



-SubTopic 10



-Section S99



-Paragraph 1



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