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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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