Lease commitments - Components of Lease Costs (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Operating leases:
Rent expense	$ 502	$ 991
Financing lease:
Leased furniture, fixtures and office equipment depreciation expense	73	97
Interest expense	11	22
Short-term leases:
Rent expense	32	257
Total lease costs	$ 618	$ 1,367
Weighted average remaining lease term
Operating Leases	6 years 4 months	6 years 4 months
Financing Lease	6 years 5 months	6 years 5 months
Weighted average discount rate
Operating Leases	5.00%	5.00%
Financing Lease	5.00%	5.00%

Operating Lease, Cost [Abstract]

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Short-term Lease, Cost [Abstract]

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Weighted Average Discount Rate [Abstract]

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Weighted Average Remaining Lease Term [Abstract]

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- Definition

Amount of interest expense on finance lease liability.

+ References

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

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