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Revenues - Deferred revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue, beginning balance	$ 3,715	$ 3,853	$ 3,820	$ 505
Addition due to business combination		(1)		2,976
Deferral of revenue	421	1,206	1,377	2,527
Recognition of deferred revenue	(594)	(1,492)	(1,665)	(2,446)
Effect of foreign currency translation	(10)	(19)	0	(15)
Deferred Revenue, ending balance	3,532	3,547	3,532	3,547
Service Contracts [Member]
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue, beginning balance	1,666	1,793	1,659	505
Addition due to business combination		(1)		848
Deferral of revenue	281	1,090	1,126	2,283
Recognition of deferred revenue	(344)	(1,169)	(1,192)	(1,927)
Effect of foreign currency translation	(10)	(19)	0	(15)
Deferred Revenue, ending balance	1,593	1,694	1,593	1,694
Customer Advances [Member]
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue, beginning balance	2,049	2,060	2,161	0
Addition due to business combination		0		2,128
Deferral of revenue	140	116	251	244
Recognition of deferred revenue	(250)	(323)	(473)	(519)
Effect of foreign currency translation	0	0	0	0
Deferred Revenue, ending balance	$ 1,939	$ 1,853	$ 1,939	$ 1,853

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Deferred Revenue Additions Due To Business Combination.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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