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Revenues - Additional Information (Details) - ASC 606 [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Direct Advertising Expenses (Exclusive of Depreciation and Amortization) [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Contract cost expense net | $ 23,085 | $ 15,734
Other Current Assets [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Capitalized contract cost, net current | $ 22,698 | $ 24,920

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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