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Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Revenue Recognition and Deferred Revenue [Abstract]
Deferred revenue	$ 6,619	$ 10,136
Contract liability	$ 1,505	$ 1,420

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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