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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2004 | Dec. 31, 2002
Loss Contingencies |  |  |  |
Operating leases, rent expense | $ 4,200 | $ 4,900 |  |
Sublease income | 345 | $ 347 |  |
Purchase obligation | $ 46 |  |  |
Minimum |  |  |  |
Loss Contingencies |  |  |  |
Remaining lease term | 1 year |  |  |
Maximum |  |  |  |
Loss Contingencies |  |  |  |
Remaining lease term | 10 years |  |  |
Travel Zoo Com Corporation |  |  |  |
Loss Contingencies |  |  |  |
Period for receiving shares under merger (in years) |  |  | 2 years | 2 years
Number of shares exchanged under merger |  |  |  | 1

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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