Goodwill and Intangible Assets - Rollforward of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 211,083
Ending balance	527,115
Trapelo Health
Goodwill [Roll Forward]
Goodwill acquired	44,664
Inivata
Goodwill [Roll Forward]
Goodwill acquired	271,368
Clinical Services
Goodwill [Roll Forward]
Beginning balance	179,534
Ending balance	462,603
Clinical Services | Trapelo Health
Goodwill [Roll Forward]
Goodwill acquired	44,664
Clinical Services | Inivata
Goodwill [Roll Forward]
Goodwill acquired	238,405
Pharma Services
Goodwill [Roll Forward]
Beginning balance	31,549
Ending balance	64,512
Pharma Services | Trapelo Health
Goodwill [Roll Forward]
Goodwill acquired	0
Pharma Services | Inivata
Goodwill [Roll Forward]
Goodwill acquired	$ 32,963