Goodwill and Intangible Assets - Rollforward of Goodwill (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 18, 2021	Sep. 30, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 211,083
Goodwill, ending balance		525,802
Trapelo Health
Goodwill [Roll Forward]
Goodwill acquired		44,664
Inivata
Goodwill [Roll Forward]
Goodwill acquired	$ 61,300	270,055
Goodwill, ending balance	270,055
Clinical Services
Goodwill [Roll Forward]
Goodwill, beginning balance		179,534
Goodwill, ending balance		461,449
Clinical Services | Trapelo Health
Goodwill [Roll Forward]
Goodwill acquired		44,664
Clinical Services | Inivata
Goodwill [Roll Forward]
Goodwill acquired		237,251
Goodwill, ending balance	237,300
Pharma Services
Goodwill [Roll Forward]
Goodwill, beginning balance		31,549
Goodwill, ending balance		64,353
Pharma Services | Trapelo Health
Goodwill [Roll Forward]
Goodwill acquired		0
Pharma Services | Inivata
Goodwill [Roll Forward]
Goodwill acquired		$ 32,804
Goodwill, ending balance	$ 32,800