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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 04, 2019	Dec. 31, 2018
Goodwill [Line Items]
Intangible assets	$ 60,900,000
Goodwill	137,823,000		$ 0
Amortization expense	11,500,000
Goodwill impairment	$ 0
SVB Leerink
Goodwill [Line Items]
Intangible assets		$ 60,900,000
Goodwill		$ 137,823,000