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Commitments and contingencies (Tables)
6 Months Ended
Jun. 30, 2016
Notes to Financial Statements  
Minimum future annual operating lease obligations
2016 (remaining)   $ 213,786  
2017     439,330  
2018     452,510  
2019     466,085  
2020     480,068  
Thereafter     535,776  
Total   $  2,587,555  
Future minimum lease payments
2016 (remainder of)   $ 11,653  
2017     23,306  
2018     23,306  
2019     23,306  
2020     23,306  
2021 and thereafter     7,904  
Less interest     (19,679 )
Principal     93,102  
Less current portion     (16,303 )
Noncurrent portion   $ 76,799