Basis of Presentation (Details) $ in Thousands	6 Months Ended
Jun. 30, 2017 USD ($) patent
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of patents held \| patent	155
Adjustment to retained earnings \| $	$ 44

Cumulative-effect adjustment to retained earnings for a change in policy election to account for forfeitures as they occur, consistent with guidance in ASU 2016-09.

No definition available.

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