Fair Value Measurement - Reconciliation of Changes in Contingent Consideration Liabilities (Details) - Level 3 - Acquisition contingent consideration liabilities - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ (8,100)	$ (8,000)	$ (23,100)
Ending balance	0	(1,400)	0	(1,400)
Advanced
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Settlement of contingent consideration liability			0	20,000
b4health
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Settlement of contingent consideration liability			8,000	0
Change in fair value of contingent consideration liability from acquisition	$ 0	$ 6,700	$ 0	$ 1,700