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Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
May 19, 2020
Jul. 16, 2019
Mar. 31, 2021
Dec. 31, 2020
Temporary Equity [Line Items]        
Conversion price per share (in dollars per share)     $ 4.00  
Series A 10% Convertible Preferred Stock        
Temporary Equity [Line Items]        
Convertible preferred stock issued/ sold (in shares)   210,000    
Face value of convertible preferred stock issued   $ 210.0    
Fair value of convertible preferred stock issued   $ 200.0    
Redemption of convertible preferred stock (in shares) 210,000      
Aggregate redemption value of convertible preferred stock issued $ 210.0      
Accrued and unpaid dividends paid $ 2.9      
Preferred stock, quarterly dividends rate 10.00%      
Series B 10% Convertible Preferred Stock        
Temporary Equity [Line Items]        
Convertible preferred stock issued/ sold (in shares)   175,000    
Proceeds from issuance of convertible preferred stock   $ 175.0    
Preferred stock, quarterly dividends rate     10.00% 10.00%
Conversion price per share (in dollars per share)     $ 4.00