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Commitments and Contingencies- Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Feb. 12, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating And Capital Leased Assets [Line Items]
Increase in future lease commitments		$ 84,200
Improvement reimbursements from landlords		12,800
Rent expense		23,100	$ 18,900	$ 13,800
Deferred rent, net of current portion		27,000	$ 19,000
Rent payable		$ 352,279
Subsequent Event [Member] | Lease Commencement, April 2019 [Member]
Operating And Capital Leased Assets [Line Items]
Lease agreement period	3 years
Lease commencement date	2019-04
Rent payable	$ 1,700

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- Definition

Deferred rent, net of current portion.

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Amount future lease payments would increase by if early termination clauses were not followed.

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The date operating lease takes effect.

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Operating and capital leased assets.

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Net cash outflow or inflow from monetary allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy.

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