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Stock-Based Compensation (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
qtr
shares
Mar. 31, 2020
USD ($)
shares
Share-based Compensation [Abstract]    
Vesting period of performance based RSU's   3 years
Stock Option [Member]    
Share-based Compensation [Abstract]    
Stock-based compensation expense $ 38,000 $ 147,000
Restricted Stock Units [Member]    
Share-based Compensation [Abstract]    
Stock-based compensation expense $ 6,000 $ 88,000
Granted time-based RSUs (in shares) | shares 0 30,000
Aggregate fair value for time-based RSUs $ 0 $ 43,000
Number of quarters time-based RSU's will vest quarterly | qtr 8  
Granted performance-based RSUs (in shares) | shares 0 510,000
Aggregate fair value for performance-based RSUs $ 0 $ 600,000
Cumulative adjustment $ 100,000 $ 200,000
Restricted Stock Units [Member] | Minimum [Member]    
Share-based Compensation [Abstract]    
Period in which time-based RSU's will vest annually in equal amounts 1 year  
Requisite service period for time-based RSU's 1 year  
Restricted Stock Units [Member] | Maximum [Member]    
Share-based Compensation [Abstract]    
Period in which time-based RSU's will vest annually in equal amounts 3 years  
Requisite service period for time-based RSU's 3 years