Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Warrants Activity) (Details)

v3.21.2
Stockholders' Equity (Warrants Activity) (Details) - Warrants [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]    
Warrants outstanding, beginning 5,402,670  
Warrants, expired (666,366)  
Warrants exercised (138)  
Warrants outstanding, ending 4,736,166 5,402,670
Warrant exercise price (in dollars per share) $ 8.16 $ 8.21
Warrants exercise price, expired (in dollars per share) 8.50  
Warrant exercise price, exercised during the period (in dollars per share) $ 0  
Warrants outstanding, remaining contractual life 8 months 23 days 1 year 4 months 20 days