Basis of Presentations and Summary of Significant Accounting Policies - Accounts Receivable (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) D	Dec. 31, 2018 USD ($)
Basis of Presentation and Summary of Significant Accounting Policies
Number of business days within which accounts receivable from credit card processors are typically received | D	3
Accounts receivable, past due time period individual account reviewed for collectibility	60 days
Allowance for doubtful account activity
Balance at beginning of period	$ 287	$ 209
Charged to costs and expenses	357	78
Write-offs, net of recoveries	(194)
Balance at end of period	$ 450	$ 287