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Redeemable Preferred Stocks - Summary of Redeemable Preferred Stocks Exchanged for Common Stock (Detail) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stockholders Equity [Line Items]                    
Beginning balance     $ 1,000,000.0         $ 1,000,000.0    
Accumulated dividends               29,914,000 $ 35,182,000 $ 30,729,000
Change in fair value of embedded derivative $ 1,106,000 $ 716,000 436,000 $ 561,000 $ 141,000 $ (120,000) $ (637,000)      
Ending balance       1,000,000.0         1,000,000.0  
Series E Redeemable Preferred Stock [Member]                    
Stockholders Equity [Line Items]                    
Beginning balance     $ 272,101,000         $ 272,101,000    
Beginning balance, shares     139,768         139,768    
Accretion relating to liquidation preference on preferred stock               $ 814,000    
Accretion for discount and issuance costs on preferred stock               709,000    
Accumulated dividends               29,914,000 35,182,000 $ 30,729,000
Costs relating to exchange transaction               (7,497,000)    
Exchange of preferred stock for common stock               $ (296,041,000)    
Exchange of preferred stock for common stock, shares               (139,768)    
Ending balance       272,101,000         272,101,000  
Series E Redeemable Preferred Stock [Member] | Accrued Liability Embedded Derivative [Member]                    
Stockholders Equity [Line Items]                    
Beginning balance     $ 1,029,000         $ 1,029,000    
Change in fair value of embedded derivative               2,258,000    
Exchange of preferred stock for common stock               $ (3,287,000)    
Ending balance       $ 1,029,000         $ 1,029,000  
Series F Redeemable Preferred Stock [Member]                    
Stockholders Equity [Line Items]                    
Beginning balance, shares     1         1    
Exchange of preferred stock for common stock, shares               (1)