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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Cost of revenue
Stock-based compensation	$ 52	$ 61	$ 147	$ 191
Additional amortization of non-cancelable prepaid royalty	(14)	4	(14)	95
Research and development
Stock-based compensation	524	562	1,442	1,801
Selling, general and administrative
Stock-based compensation	$ 443	$ 634	$ 1,401	$ 1,909

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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.

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The expense charged against earnings for the periodic recognition of the advance royalties. These royalties are paid in one accounting period, but are deducted from earnings over time through amortization. For example, royalties that are required to be paid in advance of production from a mineral, oil, or gas property and amortized over the period of right to produce these items.

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