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Acquisitions - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 03, 2020	Sep. 30, 2020	Feb. 11, 2020
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 512,989		$ 501,536
Trans-Hit Biomarkers
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 8,900
Intangible assets		7,500
Deferred tax liabilities		$ 2,300
RURO, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable				$ 1,200
Goodwill				11,100
Liabilities				3,000
Completed Technology \| RURO, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets				2,900
Customer Relationships \| RURO, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets				$ 2,900