Quarterly report pursuant to Section 13 or 15(d)

Warrants - Warrant Activity (Details)

v3.20.2
Warrants - Warrant Activity (Details)
 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Warrants  
Class of Warrant or Right [Line Items]  
Outstanding at December 31, 2019 (in shares) 1,659,763
Granted (in shares) 705,688
Exercised (in shares) (548,771)
Expired (in shares) (625,642)
Outstanding at September 30, 2020 1,191,038
Outstanding at December 31, 2019 (in per share) | $ / shares $ 10.68
Granted (in per shares) | $ / shares 8.90
Exercised (in per share) | $ / shares $ 2.35
Expired (in per share) | $ $ 24.44
Outstanding at September 30, 2020 | $ / shares $ 6.24
Pre Funded Warrants [Member]  
Class of Warrant or Right [Line Items]  
Outstanding at December 31, 2019 (in shares) 868,443
Granted (in shares) 0
Exercised (in shares) (300,350)
Expired (in shares) 0
Outstanding at September 30, 2020 568,093
Outstanding at December 31, 2019 (in per share) | $ / shares $ 0.001
Granted (in per shares) | $ / shares 0.000
Exercised (in per share) | $ / shares $ 0.001
Expired (in per share) | $ $ 0.000
Outstanding at September 30, 2020 | $ / shares $ 0.001