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7. Stock Options and Warrants (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock based compensation expense	$ 470	$ 295
Sales and marketing
Stock based compensation expense	131	99
General and administrative
Stock based compensation expense	264	101
Research and development
Stock based compensation expense	$ 75	$ 95

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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