Acquisitions - Narrative (Details) - USD ($)				3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 18, 2021	Apr. 07, 2021	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	May 31, 2020
Business Acquisition [Line Items]
Cash consideration paid						$ 0	$ 419,404,000
Common stock, par value (in dollars per share)			$ 0.001			$ 0.001		$ 0.001
Inivata Limited
Business Acquisition [Line Items]
Amount outstanding under line of credit		$ 10,300,000
Variable Interest Entity, Not Primary Beneficiary | Inivata Limited
Business Acquisition [Line Items]
Investment in minority interest									$ 25,000,000
Consideration paid to other shareholders		390,000,000
Marketing Assets
Business Acquisition [Line Items]
Amortization period of acquired intangible assets (in years)						4 years		4 years
Trademarks
Business Acquisition [Line Items]
Amortization period of acquired intangible assets (in years)						15 years		15 years
Trade Name
Business Acquisition [Line Items]
Amortization period of acquired intangible assets (in years)						5 years		5 years
Trapelo Health
Business Acquisition [Line Items]
Percentage of voting interests acquired (as a percent)			100.00%
Cash consideration paid			$ 35,591,000
Payments to acquire business, adjustments			600,000
Fair value of common stock at Trapelo Acquisition Date			$ 29,174,000
Shares of common stock issued as consideration (in shares)			597,712
Stock price per share on closing date (in dollars per share)			$ 48.81
Amortization period of acquired intangible assets (in years)			9 years 9 months 18 days
Goodwill, tax deductible amount			$ 0
Trapelo Health | Developed technology
Business Acquisition [Line Items]
Intangible assets, useful life (in years)			10 years
Trapelo Health | Marketing Assets
Business Acquisition [Line Items]
Intangible assets, useful life (in years)			4 years
Inivata
Business Acquisition [Line Items]
Cash consideration paid		398,594,000
Payments to acquire business, adjustments		$ 8,600,000
Amortization period of acquired intangible assets (in years)		14 years 10 months 24 days
Goodwill, tax deductible amount		$ 0
Line of credit		15,000,000
Net unrealized loss				$ 5,000,000
Fair value of previously-held equity interest	$ 64,900,000	64,906,000
Fair value of purchase option	$ 74,300,000	74,300,000
Gain on investment in and loan receivable from non-consolidated affiliate, net								$ 109,300,000
Increase in goodwill from deferred income tax liabilities		60,994,000
Gain on investment in and loan receivable from non-consolidated affiliate, net					$ 96,500,000		$ 91,500,000
Inivata | Clinical Services
Business Acquisition [Line Items]
Goodwill acquired		238,400,000
Inivata | Pharma Services
Business Acquisition [Line Items]
Goodwill acquired		$ 33,000,000.0
Inivata | Developed technology
Business Acquisition [Line Items]
Intangible assets, useful life (in years)		15 years
Inivata | Trademarks
Business Acquisition [Line Items]
Intangible assets, useful life (in years)		15 years
Inivata | Trade Name
Business Acquisition [Line Items]
Intangible assets, useful life (in years)		5 years