Geographic Information - Summary of geographic information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Product revenues	$ 1,699,611	$ 2,736,466
Europe
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Product revenues	825,137	1,420,653
Asia
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Product revenues	336,892	458,297
United States
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Product revenues	430,021	557,248
Others
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Product revenues	$ 107,561	$ 300,268