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v3.19.3.a.u2

Other Income, Net (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other income, net |  |  |
Interest income | $ 388,801 | $ 238,106 | $ 122,575
Realized gain (losses) on maturities of investments | 10,764 | (29,308) | (6,761)
Foreign currency exchange losses | (3,653) | (15,261) | (4,437)
Total other income, net | $ 395,912 | $ 193,537 | $ 111,377

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