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
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Shares  
Beginning Balance | shares 1,225
Granted or Issued | shares 52
Ending Balance | shares 1,277
Warrants exercisable at June 30, 2018 | shares 1,250
Weighted Average Exercise Price  
Beginning Balance | $ / shares $ 9.63
Granted or Issued | $ / shares 2.35
Ending Balance | $ / shares 9.33
Warrants exercisable at June 30, 2018 | $ / shares $ 9.10