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Pension benefits (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of the year	$ 3,121	$ 2,896
Service cost	344	333
Interest cost	198	187
Curtailment and other adjustments	14	(69)
Actuarial gain	(622)	(107)
Foreign currency exchange rates changes	(251)	51
Benefits paid	(213)	(170)
Projected benefit obligation at end of the year	$ 2,591	$ 3,121

X

- Definition

Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future services of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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