Quarterly report pursuant to Section 13 or 15(d)

Summary of Warrant Activity (Detail)

v3.20.2
Summary of Warrant Activity (Detail) - Warrants
shares in Thousands
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Beginning Balance | shares 2,083
Granted or Issued | shares 55,864
Exercised | shares (116)
Ending Balance | shares 57,831
Warrants exercisable at September 30, 2020 | shares 57,831
Beginning Balance | $ / shares $ 6.12
Granted or Issued | $ / shares 0.42
Exercised | $ / shares 0.40
Ending Balance | $ / shares 0.62
Warrants exercisable at September 30, 2020 | $ / shares $ 0.62