Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Summary of Anti-Dilutive Equivalent Units Outstanding Excluded From Calculation of Earnings Per Share (Detail)

v3.7.0.1
Earnings Per Share - Summary of Anti-Dilutive Equivalent Units Outstanding Excluded From Calculation of Earnings Per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 9,196 6,388
Common stock purchase warrants (in shares)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 6,608 4,362
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 2,520 1,928
Restricted shares of common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 68 98