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Note 7 - Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock-based compensation expense	$ 7,476	$ 7,511	$ 23,647	$ 18,697
Impact on basic and diluted net loss per share (in dollars per share)	$ 0.14	$ 0.19	$ 0.45	$ 0.50
Research and Development Expense [Member]
Stock-based compensation expense	$ 2,595	$ 3,946	$ 8,758	$ 8,347
General and Administrative Expense [Member]
Stock-based compensation expense	2,419	1,763	7,345	5,229
Selling and Marketing Expense [Member]
Stock-based compensation expense	$ 2,462	$ 1,802	$ 7,544	$ 5,121

X

- Definition

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

+ References

No definition available.

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- 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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