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Note 7 - Stockholders' Equity - Allocation of the Recognized Cost (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based compensation expense	$ 8,150	$ 5,831	$ 16,171	$ 11,186
Impact on basic and diluted net loss per share (in dollars per share)	$ 0.15	$ 0.16	$ 0.31	$ 0.31
Research and Development Expense [Member]
Share-based compensation expense	$ 2,955	$ 2,329	$ 6,163	$ 4,402
General and Administrative Expense [Member]
Share-based compensation expense	2,552	1,798	4,926	3,465
Selling and Marketing Expense [Member]
Share-based compensation expense	$ 2,643	$ 1,704	$ 5,082	$ 3,319

X

- Definition

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

+ References

No definition available.

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X

- Definition

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
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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