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Basis of presentation, summary of significant accounting policies and recent accounting pronouncements (Tables)
6 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities

Securities that could potentially dilute loss per share in the future were not included in the computation of diluted loss per share at June 30, 2019 and 2018 because their inclusion would be anti-dilutive are as follows:

 

   June 30,
   2019  2018
Warrants to purchase common stock   3,574,257    1,671,113 
Options to purchase common stock   12,000    150,000 
Escrow shares   200,000    200,000 
Unvested restricted stock awards   42,980    571,567 
Convertible Series B preferred shares   4,999    703,000 
Total   3,834,236    3,295,680