The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 04, 2019	Dec. 31, 2018
Goodwill [Line Items]
Intangible assets	$ 60,900
Goodwill	137,823		$ 0
Amortization expense	$ 5,700
SVB Leerink
Goodwill [Line Items]
Intangible assets		$ 60,900
Goodwill		$ 137,823