Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Warrants and Options Excluded from Computation of Diluted Net Loss Per Share (Detail)

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Net Loss Per Common Share - Warrants and Options Excluded from Computation of Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares issuable 3,522 35
Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares issuable 4,347 450