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Other (expense) income (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other (expense) income      
Foreign exchange gain (loss) $ 165,000 $ (602,000) $ 232,000
Gain on available-for-sale securities   77,000 429,000
Other income (expense) 187,000 (28,000) 199,000
Other (expense) income, Total $ 352,000 $ (553,000) $ 860,000