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Convertible Preferred Stock and Stockholders' Deficit - Schedule of Authorized, Issued and Outstanding Shares of Non-redeemable Convertible Preferred Stock (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Class Of Stock [Line Items]    
Shares Authorized 20,000,000  
Series B [Member]    
Class Of Stock [Line Items]    
Shares Authorized 5,000,000 5,000,000
Shares Issued 250,000 250,000
Shares Outstanding 250,000 250,000
Liquidation Preference $ 445 $ 441
Series G [Member]    
Class Of Stock [Line Items]    
Shares Authorized 5,000,000 5,000,000
Shares Issued 5,000,000 5,000,000
Shares Outstanding 5,000,000 5,000,000
Liquidation Preference $ 5,000 $ 5,000
Carrying Value $ 5 $ 5
Series I-1 [Member]    
Class Of Stock [Line Items]    
Shares Authorized 2,000 2,000
Shares Issued 814 814
Shares Outstanding 814 814
Liquidation Preference $ 814 $ 814
Series I-2 [Member]    
Class Of Stock [Line Items]    
Shares Authorized 4,310 4,310
Shares Issued 4,310 4,310
Shares Outstanding 4,310 4,310
Liquidation Preference $ 4,310 $ 4,310
Series B, Series G, Series I-1 and Series I-2 Non-redeemable Convertible Preferred Stock [Member]    
Class Of Stock [Line Items]    
Shares Authorized 10,006,310 10,006,310
Shares Issued 5,255,124 5,255,124
Shares Outstanding 5,255,124 5,255,124
Liquidation Preference $ 10,569 $ 10,565
Carrying Value $ 5 $ 5