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Stockholders' Equity - Series A Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 17, 2006
Sep. 30, 2006
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]        
Accrued dividend during the period     $ 24 $ 24
Accumulated Deficit        
Class of Stock [Line Items]        
Accrued dividend during the period     $ 24 24
Series A Convertible Preferred Stock        
Class of Stock [Line Items]        
Cumulative dividend rate (as a percent)     4.00%  
Accrued cumulative unpaid preferred stock dividends     $ 414 $ 390
Stated value (in dollars per share)     $ 10  
Conversion price per share (in dollars per share) $ 691.20 $ 928.80 691.20  
Period during which the conversion price is subject to adjustment for dilutive issuances 12 months      
Share price for 20 consecutive trading days for automatic conversion     $ 1,857.6  
Number of consecutive trading days in which the closing price of the entity's common stock must equal or exceed a specified price in order for the preferred stock to be automatically converted     20 days  
Number of common stock shares traded per day during the 20 trading days for the preferred stock to be automatically converted     116  
Number of trading days in which the specified volume of common stock must be traded for the preferred stock to be automatically converted     20 days