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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue Recognition |  |  |
Accumulated income | $ 172,378 |  | $ 156,151
License Length | 3 years |  |
ASU 2014-09 |  |  |
Revenue Recognition |  |  |
Accumulated income |  | $ 11,900 |
Revenues | $ 3,400 |  |

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