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Discontinued operations - CW-Belize - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2019 | Feb. 14, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Gain on sale of discontinued operations |  |  | $ 0 | $ 0 | $ 0 | $ 3,621,170
CW Belize [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 7,000,000.0 |  |  |  |
Proceeds from Divestiture of Businesses | $ 265,000 | 6,735,000 |  |  |  |
Supplemental Deferred Purchase Price |  | $ 265,000 |  |  |  |
Gain on sale of discontinued operations |  |  |  |  |  | $ 3,621,170

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