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Commitments and Contingencies (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 27, 2016 USD ($)	Aug. 31, 2013 Company	Sep. 30, 2018 USD ($) Case States	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Case States	Sep. 30, 2017 USD ($)
Operating Leases [Abstract]
Rent expense | $			$ 375	$ 345	$ 998	$ 990
Litigation and Contingencies [Abstract]
Number of companies patent infringement lawsuits filed | Company		6
Number of cases resolved					3
Number of cases pending			2		2
Number of cases filed					3
Number of states in the antitrust litigation | States			41		41
Damages claimed | $	$ 100,000

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The number of states in the antitrust litigation.

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Number of claims settled.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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The total number of new claims filed pertaining to a loss contingency during the period.

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Number of defendants named in a legal action.

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Number of pending claims pertaining to a loss contingency.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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