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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Loss per Share Attributable to Common Shareholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Schedule Of Basic And Diluted Net Income Loss Per Share [Line Items]    
Net loss $ (3,253) $ (1,485)
Preferred dividends 634 529
Net loss attributable to common shareholders $ (3,887) $ (2,014)
Basic and diluted weighted average common shares outstanding 7,115 7,084
Basic and diluted loss per share attributable to common shareholders $ (0.55) $ (0.28)
Net income (loss) per share attributable to common shareholders $ (0.55) $ (0.28)
Class A Common Stock    
Schedule Of Basic And Diluted Net Income Loss Per Share [Line Items]    
Basic and diluted weighted average common shares outstanding 1,702,000 1,680,000
Class B Common Stock    
Schedule Of Basic And Diluted Net Income Loss Per Share [Line Items]    
Basic and diluted weighted average common shares outstanding 5,413,000 5,404,000
Basic and diluted loss per share attributable to common shareholders $ (0.55) $ (0.28)
Net income (loss) per share attributable to common shareholders $ (0.55) $ (0.28)