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Significant Accounting Policies - Schedule of Property and Equipment Recorded at Cost and Depreciated on Straight-line Basis Over Estimated Useful Lives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 72,325	$ 61,346
Less: Accumulated depreciation	(30,843)	(21,606)
Property and equipment, net	41,482	39,740
Computer Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 29,300	19,622
Computer Software | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives	18 months
Computer Software | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives	5 years
Computer Hardware
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 19,461	20,523
Computer Hardware | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives	3 years
Computer Hardware | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives	5 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 4,970	3,879
Estimated useful lives	10 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 18,594	$ 17,322
Estimated useful lives	Lesser of useful life or lease term

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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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.

+ References

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