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Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Goodwill, Beginning Balance $ 20,382,000 $ 20,717,000  
Addition (note) 815,000    
Foreign currency translation adjustment 1,410,000 (335,000)  
Goodwill, Ending Balance 22,607,000 20,382,000 $ 20,717,000
Impairment loss $ 0 $ 0 $ 0