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Other income, net (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other income, net |  |  |
Foreign exchange gain (loss) | $ (434,000) | $ (411,000) | $ 321,000
Income from local China government subsidy | 1,125,000 | 3,800,000 | 808,000
Other expense | (182,000) | (189,000) | (182,000)
Total other income, net | $ 509,000 | $ 3,200,000 | $ 947,000

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