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Income (Loss) Per Share - Summary of Shares Equivalents Excluded from Discontinued Operations Dilutive Share Computation (Detail) - Discontinued Operations [Member]
3 Months Ended
Mar. 31, 2019
shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive securities excluded from diluted share computation 1,055
Restricted Stock Awards [Member]  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive securities excluded from diluted share computation 76
Stock Options [Member]  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive securities excluded from diluted share computation 322
Warrants [Member]  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive securities excluded from diluted share computation 657