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Revenues - Deferred revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Deferred Revenue, beginning balance | $ 3,532 | $ 3,547 | $ 3,820 | $ 505
Addition due to business combination |  | 0 |  | 2,976
Deferral of revenue | 781 | 991 | 2,158 | 3,518
Recognition of deferred revenue | (779) | (1,280) | (2,444) | (3,726)
Effect of foreign currency translation | 16 | 9 | 16 | (6)
Deferred Revenue, ending balance | 3,550 | 3,267 | 3,550 | 3,267
Service Contracts [Member] |  |  |  |
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Deferred Revenue, beginning balance | 1,593 | 1,694 | 1,659 | 505
Addition due to business combination |  | 0 |  | 848
Deferral of revenue | 471 | 801 | 1,597 | 3,084
Recognition of deferred revenue | (358) | (1,006) | (1,550) | (2,933)
Effect of foreign currency translation | 16 | 9 | 16 | (6)
Deferred Revenue, ending balance | 1,722 | 1,498 | 1,722 | 1,498
Customer Advances [Member] |  |  |  |
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Deferred Revenue, beginning balance | 1,939 | 1,853 | 2,161 | 0
Addition due to business combination |  | 0 |  | 2,128
Deferral of revenue | 310 | 190 | 561 | 434
Recognition of deferred revenue | (421) | (274) | (894) | (793)
Effect of foreign currency translation | 0 | 0 | 0 | 0
Deferred Revenue, ending balance | $ 1,828 | $ 1,769 | $ 1,828 | $ 1,769

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- Definition 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. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 + Details
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