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Financial instruments (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Recurring    
Restricted cash $ 0 $ 428,203
Certificate of deposit 0 5,637,538
Net put/call option liability [1] 680,000 0
Total assets recurring   6,065,741
Fair Value, Inputs, Level 1 [Member]    
Recurring    
Restricted cash   428,203
Certificate of deposit   0
Net put/call option liability 0  
Total assets recurring   428,203
Fair Value, Inputs, Level 2 [Member]    
Recurring    
Restricted cash   0
Certificate of deposit   5,637,538
Net put/call option liability 0  
Total assets recurring   5,637,538
Fair Value, Inputs, Level 3 [Member]    
Recurring    
Restricted cash   0
Certificate of deposit   0
Net put/call option liability $ 680,000  
Total assets recurring   $ 0
[1] The net liability arising from the put/call options is included other liabilities in the accompanying condensed consolidated balance sheets as of December 31, 2016.