Quarterly report pursuant to Section 13 or 15(d)

Summary of Warrant Activity (Detail)

v3.19.2
Summary of Warrant Activity (Detail) - Warrants
shares in Thousands
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Shares  
Beginning Balance | shares 1,934
Granted or Issued | shares 149
Ending Balance | shares 2,083
Warrants exercisable at June 30, 2019 | shares 2,083
Weighted Average Exercise Price  
Beginning Balance | $ / shares $ 6.62
Granted or Issued | $ / shares 2.22
Ending Balance | $ / shares 6.30
Warrants exercisable at June 30, 2019 | $ / shares $ 6.30