Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Net Loss Per Share - Warrants, Options and Purchase Rights Excluded from Computation of Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Warrants        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 3,274 49 3,274 49
Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 1,870 856 1,870 856