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Description of the Business and Summary of Significant Accounting Policies - ASU 2014-09 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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ASU 2014-09 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative prior period adjustment to retained earnings | $ 134 | $ 100

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