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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2004 | Dec. 31, 2002
Loss Contingencies |  |  |  |
Operating leases, rent expense | $ 5,800 |  |  |
Operating leases, rent expense |  | $ 5,800 |  |
Sublease income | 347 | $ 123 |  |
Purchase Obligation | $ 50 |  |  |
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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