Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation, summary of significant accounting policies (Schedule of Antidilutive Securities) (Details)

v3.21.1
Basis of presentation, summary of significant accounting policies (Schedule of Antidilutive Securities) (Details)
3 Months Ended
Mar. 31, 2020
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Shares not included in the computation of EPS 5,015,480
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 12,000
Unvested restricted stock awards [Member]  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Shares not included in the computation of EPS 1,445,024
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 3,554,257
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 4,199