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Patents Cost and Accumulated Amortization (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Patents [Line Items] |  |
Capitalized patent costs | $ 117,970 | $ 0
Accumulated amortization / impairment charges | $ 109,663 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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