Stock-based compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Stock-based compensation expenses	$ 217,178us-gaap_ShareBasedCompensation	$ 249,704us-gaap_ShareBasedCompensation
Total compensation cost not yet recognized	365,279
Total compensation cost not yet recognized, Period for recognition	2 years 9 months 11 days
Cost of revenues
Stock-based compensation expenses	21,597	26,196
Research and development
Stock-based compensation expenses	54,679	72,104
Sales and marketing
Stock-based compensation expenses	33,030	43,970
General and administrative
Stock-based compensation expenses	$ 107,872	$ 107,434

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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