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Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	13. Subsequent Event On July 24, 2018, the U.S. Court of Appeals for the Ninth Circuit reversed the decision of the U.S. Tax Court in Altera Corp. v. Commissioner related to the treatment of stock-based compensation in an intercompany cost-sharing arrangement. The Company is currently evaluating the impact of this decision and such impact could be material to its financial statements.