Revenue - Summary of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue		$ 176,635	$ 123,295	$ 337,066	$ 256,703
Prescription Transactions Revenue
Disaggregation Of Revenue [Line Items]
Revenue		144,857	109,548	278,918	232,565
Subscription Revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	14,316	6,358	26,323	11,998
Other Revenue
Disaggregation Of Revenue [Line Items]
Revenue		$ 17,462	$ 7,389	$ 31,825	$ 12,140

[1] Represents revenue from the Company's Gold and Kroger Savings subscription offerings. Subscription revenue is disclosed separately from other revenue beginning in the second quarter of 2021. Prior period amounts have been recast to conform with the current period presentation.