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
 6 Months Ended
Jun. 30, 2020
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Beginning Balance | shares 2,083
Granted or Issued | shares 10,864
Ending Balance | shares 12,947
Warrants exercisable at June 30, 2020 | shares 12,947
Beginning Balance | $ / shares $ 6.12
Granted or Issued | $ / shares 0.51
Ending Balance | $ / shares 1.39
Warrants exercisable at June 30, 2020 | $ / shares $ 1.39