Quarterly report pursuant to Section 13 or 15(d)

Warrants - Warrant Activity (Details)

v3.20.2
Warrants - Warrant Activity (Details)
 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Warrant [Member]  
Class of Warrant or Right [Line Items]  
Outstanding at December 31, 2019 (in shares) 2,463,063
Exercised (in shares) (75,718)
Expired (in shares) (616,648)
Outstanding at June 30, 2020 1,770,697
Outstanding at December 31, 2019 (in per share) | $ / shares $ 7.96
Exercised (in per share) | $ / shares $ 2.32
Expired (in per share) | $ $ 24.28
Outstanding at June 30, 2020 | $ / shares $ 2.51
Pre Funded Warrants [Member]  
Class of Warrant or Right [Line Items]  
Outstanding at December 31, 2019 (in shares) 868,443
Exercised (in shares) (150,000)
Outstanding at June 30, 2020 718,443
Outstanding at December 31, 2019 (in per share) | $ / shares $ 0.001
Exercised (in per share) | $ / shares 0.001
Outstanding at June 30, 2020 | $ / shares $ 0.001