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Discontinued operations - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 07, 2019 | Aug. 31, 2019 | Feb. 14, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Discontinued operations - CW-Belize |  |  |  |  |  |  |
Proceeds From Repatriated Funds | $ 1,100,000 |  |  | $ 1,000,000 | $ 2,750,000 | $ 458,000 | $ 400,000
Disposal Group, Including Discontinued Operation, Consideration |  |  | $ 7,000,000 |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 265,000 | 6,735,000 |  |  |  |
Supplemental Deferred Purchase Price |  |  | $ 265,000 |  |  |  |

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