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Stock-Based Compensation - Restricted Stock Awards, Restricted Stock Units and Common Stock Awards (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restricted stock    
Number of Restricted Stock Unit Awards    
Granted (in shares) 0 0
Restricted stock units    
Number of Restricted Stock Unit Awards    
Nonvested restricted shares outstanding, beginning balance (in shares) 174,000  
Granted (in shares) 335,000 0
Vested (in shares) (174,000)  
Nonvested restricted shares outstanding, ending balance (in shares) 335,000 174,000
Weighted Average Grant-Date Fair Value    
Nonvested restricted shares outstanding, beginning balance (in dollars per share) $ 7.10  
Granted (in dollars per share) 1.98  
Vested (in dollars per share) 7.10  
Nonvested restricted shares outstanding, ending balance (in dollars per share) $ 1.98 $ 7.10
Additional disclosures    
Annual increment period 3 years  
Unrecognized compensation cost $ 413,000  
Period over which unrecognized compensation expense is expected to be recognized 7 months 13 days  
Aggregate vesting date fair value of restricted awards $ 416,000 $ 360,000
Restricted stock units | Minimum    
Additional disclosures    
Vesting period 1 year  
Restricted stock units | Maximum    
Additional disclosures    
Vesting period 3 years  
Common stock awards    
Number of Restricted Stock Unit Awards    
Granted (in shares) 23,272  
Weighted Average Grant-Date Fair Value    
Granted (in dollars per share) $ 2.58