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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 |

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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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