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4. Accrued contingent consideration (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Business Combinations [Abstract]  
Business Combination, Contingent Consideration Arrangements, Description 30%
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 200,000
Contingent Consideration Amount $ 60,000