Revenue Recognition - Summary of Revenue Disaggregated by Program (Parenthetical) (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	$ 120,071	$ 81,923	$ 228,156	$ 241,615
Well-Being Program
Disaggregation Of Revenue [Line Items]
Revenue		6,800		6,800
Wisely Well brand
Disaggregation Of Revenue [Line Items]
Revenue		$ 2,100		$ 2,100