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Operating Expenses, Shares Held by Directors and Executives (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Expense [Abstract]      
Number of shares held by Directors and Executives as a group (in shares) [1] 2,958,894 2,303,011 3,615,221
Number of restricted stock subject to vesting conditions (in shares) 725,665 619,998 440,000
Period of base salary entitled to executive officer in connection with termination of employment 18 months    
[1] Includes 725,665 (2020: 619,998, 2019: 440,000) shares of restricted stock subject to vesting conditions.