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Significant Accounting Policies - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Impairment loss	$ 0
Depreciation and amortization	31,400,000	$ 18,700,000	$ 17,800,000
Computer software | Capella Merger
Property, Plant and Equipment [Line Items]
Depreciation	$ 2,600,000
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Minimum | Computer software
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	40 years
Maximum | Computer software
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	10 years

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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