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Stock-Based Compensation (Details 2) (Warrant [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of stock-based compensation expense
Share-based compensation expense	$ 586	$ 34
Remaining unamortized expense of stock-based compensation	3,060
Product research and development [Member]
Summary of stock-based compensation expense
Share-based compensation expense	60	10
Sales and marketing [Member]
Summary of stock-based compensation expense
Share-based compensation expense	196	24
General and administrative [Member]
Summary of stock-based compensation expense
Share-based compensation expense	$ 330

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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