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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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- 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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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