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Revenue From Contracts with Customers - Current and Deferred Contracts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Movement in Deferred Revenue [Roll Forward] |  |  |
Balance as of December 31, 2017 |  | $ 20,784 |
Revenue recognized that was included in the deferred revenue balance at the beginning of the period |  | (20,604) | $ 0
Deferred Revenue, Period Increase (Decrease) |  | 467 |
Balance as of June 30, 2018 |  | 555 |
Balance as of December 31, 2017 |  | 0 |
Increases due to cash received, excluding amounts recognized as revenue during the period |  | 8,242 |
Balance as of June 30, 2018 |  | 7,732 |
Increase (Decrease) in Deferred Revenue | $ (510) | $ (92) |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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