Revenue Recognition - Additional Information (Details)		12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2020 USD ($) Program Segment Obligation	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Disaggregation Of Revenue [Line Items]
Number of programs | Program		4
Deferred revenue		$ 4,460,000	$ 4,336,000
Increase in deferred revenue	$ 3,200,000	$ 686,000	(1,198,000)
Number of reportable segments | Segment		1
Continuing Operations
Disaggregation Of Revenue [Line Items]
Number of programs | Program		3
Number of performance obligations | Obligation		1
Deferred revenue		$ 4,500,000	4,300,000
Revenue recognized		3,600,000
Increase in deferred revenue		$ 3,800,000
Period of billing in arrears once timing of services to customers is known		1 month
Number of days for customer to make payment after being invoiced		30 days
Capitalized costs		$ 800,000	500,000
Capitalized costs, amortization expense		$ 400,000	$ 100,000	$ 0
Number of reportable segments | Segment		1
Continuing Operations | SilverSneakers
Disaggregation Of Revenue [Line Items]
Revenues from PMPM fees percentage		54.00%	33.00%