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Revenue Recognition (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 20, 2017
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Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accumulated deficit | $ (120,361) | $ (79,861) |
ASC 606 [Member] | Difference between Revenue Guidance in Effect Before and After Topic 606 |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accumulated deficit |  |  | $ (1,000)

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