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Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2019
USD ($)
qtr
shares
Jun. 30, 2018
USD ($)
shares
Share-based Compensation [Abstract]        
Aggregate fair value for performance-based RSUs $ 0      
Restricted Stock Units [Member]        
Share-based Compensation [Abstract]        
Stock-based compensation expense $ (60,000) $ 28,000 $ (33,000) $ (60,000)
Granted performance-based RSUs (in shares) | shares 0   350,000  
Aggregate fair value for performance-based RSUs     $ 900,000  
Granted time-based RSUs (in shares) | shares 200,000 200,000 500,000 400,000
Aggregate fair value for time-based RSUs $ 600,000 $ 600,000 $ 1,400,000 $ 1,300,000
Number of quarters time-based RSU's will vest quarterly | qtr     8  
Period in which time-based RSU's will vest annually in equal amounts     3 years  
Restricted Stock Units [Member] | Minimum [Member]        
Share-based Compensation [Abstract]        
Requisite service period for time-based RSU's     1 year  
Restricted Stock Units [Member] | Maximum [Member]        
Share-based Compensation [Abstract]        
Requisite service period for time-based RSU's     3 years  
Stock Option [Member]        
Share-based Compensation [Abstract]        
Stock-based compensation expense $ 499,000 $ 373,000 $ 1,069,000 $ 968,000