Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Finance lease cost:
Amortization of right-of-use assets	$ 54	$ 109
Interest on lease obligations	3	6
Operating lease cost	1,100	2,278
Sublease income	(254)	(465)
Total lease cost	$ 903	$ 1,928
Weighted-average remaining lease term (in years):
Finance leases	24 days	24 days
Operating leases	8 years 1 month 6 days	8 years 1 month 6 days
Weighted-average discount rate:
Finance leases	5.00%	5.00%	5.00%
Operating leases	6.60%	6.60%	6.60%
Cash paid for amounts included in the measurement of lease obligations
Operating cash flows from operating leases		$ (1,633)
Operating cash flows from finance leases		(6)
Financing cash flows from finance leases		$ (119)

Lease, Supplemental Cash Flow [Abstract]

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- Definition

Lessee, Weighted-average Discount Rate [Abstract]

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Lessee, Weighted-average Remaining Lease Term [Abstract]

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- Definition

Amount of interest expense on finance lease liability.

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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 cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for 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 sublease income excluding finance and operating lease expense.

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