Quarterly report pursuant to Section 13 or 15(d)

Capital Stock - Series X Convertible Preferred Stock (Details)

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Capital Stock - Series X Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Mar. 31, 2022
Dec. 31, 2021
Sale of stock      
Preferred stock, shares authorized (in shares)   1,000,000 1,000,000
Series X Convertible Preferred Stock      
Sale of stock      
Shares issued (in shares) 5,003    
Preferred stock, shares authorized (in shares)   5,003 5,003
Preferred stock, shares issued (in shares)   5,003 5,003
Number of shares issued for each share of convertible preferred stock that is converted 1,000    
Preferred stock conversion price per share $ 4.03    
Fair value of common stock amount exceeded purchase price of convertible preferred stock $ 5.6