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Commitments and Contingencies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Non-cancelable operating lease, rent expense $ 1,114,000 $ 1,411,000 $ 1,415,000
Capital lease assets 2,097,000    
Capital lease assets, accumulated amortization 104    
Interest expense associated with leases 104,000    
Operating Leases      
2019 717,000    
2020 611,000    
2021 494,000    
2022 466,000    
2023 479,000    
Thereafter 1,041,000    
Total 3,808,000    
Capital Leases      
2019 532,000    
2020 532,000    
2021 519,000    
2022 317,000    
2023 40,000    
Thereafter 0    
Total 1,940,000    
Less: Amount representing interest (151,000)    
Present value of net minimum lease payments $ 1,789,000