Stockholders' Equity - Warrants Issued to USAA and Third Party Marketing Firm (Details) - USAA - Common Stock Purchase Warrants		12 Months Ended
	May 01, 2014 tranche $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Convertible Preferred Stock and Stockholders' Equity
Warrant expense | $		$ 0	$ 0	$ 0
Affinity Group Marketing Agreement
Convertible Preferred Stock and Stockholders' Equity
Maximum number of shares under warrant agreement	1,458,979
Number of warrant tranches | tranche	2
Affinity Group Marketing Agreement | Tranche One
Convertible Preferred Stock and Stockholders' Equity
Maximum number of shares under warrant agreement	392,313
Exercise price of warrants (in dollars per share) | $ / shares	$ 7.95
Affinity Group Marketing Agreement | Tranche Two
Convertible Preferred Stock and Stockholders' Equity
Maximum number of shares under warrant agreement	1,066,666
Exercise price of warrants (in dollars per share) | $ / shares	$ 15.00