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Stock-Based Compensation (Details 3) (Warrant [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of stock-based compensation expense
Share-based compensation expense	$ 3,499,000	$ 550,000
Remaining unamortized expense of stock-based compensation	3,568,000
Product research and development [Member]
Summary of stock-based compensation expense
Share-based compensation expense	315,000	11,000
Sales and marketing [Member]
Summary of stock-based compensation expense
Share-based compensation expense	1,407,000	99,000
General and administrative [Member]
Summary of stock-based compensation expense
Share-based compensation expense	$ 1,777,000	$ 440,000

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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