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Income (Loss) Per Share - Summary of Shares Equivalents Excluded from Continued Operations Dilutive Share Computation (Detail) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted share computation (in shares) 195 1,155
Restricted stock awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted share computation (in shares) 0 174
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted share computation (in shares) 46 255
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted share computation (in shares) 149 726