Quarterly report pursuant to Section 13 or 15(d)

Summary of Warrant Activity (Detail)

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Summary of Warrant Activity (Detail) - Warrants
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Beginning Balance | shares 1,225
Granted or Issued | shares 108
Forfeited, cancelled, or expired | shares (52)
Ending Balance | shares 1,281
Warrants exercisable at September 30, 2018 | shares 1,255
Weighted Average Exercise Price  
Beginning Balance | $ / shares $ 9.63
Granted or Issued | $ / shares 2.24
Forfeited, cancelled, or expired | $ / shares 2.35
Ending Balance | $ / shares 9.21
Warrants exercisable at September 30, 2018 | $ / shares $ 9.07