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Restructuring (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |
Total consideration |  | $ 1,953
UNITED KINGDOM |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance Costs | $ 600 | $ 1,600
UNITED STATES |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance Costs | $ 1,900 |
Shares repurchased | 319,257 |
Total consideration | $ 3,100 |

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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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