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15. Commitments and contingencies (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Contractual Obligation    
Total $ 11,112,059 $ 7,736,811
2014 7,779,407 4,744,117
2015 1,680,958 1,583,949
2016 1,516,681 1,273,732
2017 and Later 135,013 135,013
Notes payable
    
Contractual Obligation    
Total 2,931,593 1,867,002
2014 2,931,593 1,867,002
2015    0
2016    0
2017 and Later    0
Deferred salary
    
Contractual Obligation    
Total 838,476 571,328
2014 838,476 571,328
2015    0
2016    0
2017 and Later    0
Rent obligations
    
Contractual Obligation    
Total 1,260,644 1,121,495
2014 677,737 878,546
2015 339,958 242,949
2016 242,949 0
2017 and Later    0
Accrued board fees
    
Contractual Obligation    
Total 1,515,820  
2014 1,515,820  
2015     
2016     
2017 and Later     
Employee contracts: other
    
Contractual Obligation    
Total 3,931,156 156,358
2014 1,181,411 156,358
2015 1,341,000 0
2016 1,273,732 0
2017 and Later 135,013 0
Accrued interest
    
Contractual Obligation    
Total 634,370 89,472
2014 634,370 89,472
2015    0
2016    0
2017 and Later    0
Employee Contracts
    
Contractual Obligation    
Total   3,931,156
2014   1,181,411
2015   1,341,000
2016   1,273,732
2017 and Later   $ 135,013