For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Revenue - Narrative (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue Benchmark \| One Travel Agency
Product Information [Line Items]
Percentage of total revenues	31.00%
Revenue Benchmark \| First Travel Agency
Product Information [Line Items]
Percentage of total revenues	39.00%
Revenue Benchmark \| Second Travel Agency
Product Information [Line Items]
Percentage of total revenues	12.00%
Revenue Benchmark \| Third Travel Agency
Product Information [Line Items]
Percentage of total revenues	11.00%
Accounts Receivable \| Two Travel Agencies
Product Information [Line Items]
Percentage of total revenues		34.00%