Commitments and Contingencies - Class action settlement specific to credit card fees (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)
Commitments and Contingencies
Amount received in settlement specific to credit card fees	$ 7.0

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

No definition available.

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration