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Commitments and Contingencies - Components of Lease Cost for Operating and Finance Leases (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating leases
Operating lease cost	$ 694
Variable lease cost	263
Operating and variable lease cost	957
Short-term lease cost	119
Finance leases
Depreciation on finance leases	47
Interest on finance leases	7
Finance lease cost	54
Total lease cost	$ 1,130

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Finance Lease cost.

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Operating and variable lease cost.

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Operating lease cost.

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Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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