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4. Accrued contingent consideration (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Business Combinations [Abstract]      
Business Combination, Contingent Consideration Arrangements, Description   30%  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 400,000 $ 400,000  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 1,500,000 1,500,000  
Business Acquisition, Contingent Consideration, at Fair Value 760,000 760,000 960,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset $ 9 $ 200,000