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Consolidated Balance Sheet Detail - Schedule of Intangible assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Intangible assets
Net Carrying Value	$ 111
Patent license
Intangible assets
Life	7 years
Gross Carrying Amount	$ 780
Accumulated Amortization	669
Net Carrying Value	$ 111

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