Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation, summary of significant accounting policies (Loss Per Share) (Details)

v3.8.0.1
Basis of presentation, summary of significant accounting policies (Loss Per Share) (Details) - shares
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 3,974,741 1,594,750
Warrants to purchase common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 1,831,886 897,003
Option to purchase common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 150,000 552,747
Restricted stock units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 864,855 145,000
Escrow shares of common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 200,000
Convertible Series B preferred shares [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 982,000