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Summary of Significant Accounting Policies - Stock-based compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation expenses included in the statement of operations	$ 597,668	$ 723,199	$ 676,544
Cost of revenues
Stock-based compensation expenses included in the statement of operations	50,660	61,994	55,607
Research and development
Stock-based compensation expenses included in the statement of operations	136,618	165,028	151,978
Sales and marketing
Stock-based compensation expenses included in the statement of operations	128,759	177,065	196,368
General and administrative
Stock-based compensation expenses included in the statement of operations	$ 281,631	$ 319,112	$ 272,601

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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