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Income Taxes - Uncertain tax positions (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Movement in uncertain tax positions |  |  |
Gross increase — tax position in prior periods | $ 100,000 | $ 100,000 | $ 100,000
Gross increase - tax position in prior periods | 400,000 | 0 | 0
Gross decrease — tax position in prior periods | 0 | 0 | 0
Gross increase — current period tax position | 0 | 0 | 0
Settlements | 0 | 0 | 0
Lapse in statute of limitations | 0 | 0 | 0
Foreign exchange | 0 | 0 | 0
Uncertain tax positions at the end of the period | 500,000 | $ 100,000 | $ 100,000
Interest and penalties included within uncertain tax positions | $ 0 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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