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Condensed Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cost of revenue
Additional amortization of non-cancelable prepaid royalty	$ 142	$ 103	$ 430	$ 321
Stock-based compensation	42	34	118	93
Research and development
Stock-based compensation	214	214	619	624
Selling, general and administrative
Stock-based compensation	$ 296	$ 260	$ 793	$ 771

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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- Definition

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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