Revenue Recognition - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cost of Revenues [Member]
Disaggregation Of Revenue [Line Items]
Amortization of deferred contract cost	$ 400,000
Accounts Receivable [Member]
Disaggregation Of Revenue [Line Items]
Description of payment terms	customers are typically required to pay with major credit cards, reducing our credit risk to individual customers. Amounts are billed immediately, and our cruise line and destination resort partners typically remit payments to us within 30 days.
Receivables from contracts with customers	$ 3,000,000	$ 30,500,000
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Liability for unredeemed gift cards	700,000	800,000
Other Non-current Assets [Member]
Disaggregation Of Revenue [Line Items]
Deferred contract cost	$ 3,100,000	$ 0