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Financial Information About Segments - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
Segment
Dec. 31, 2013
Segment Reporting [Abstract]    
Number of operating segments 2us-gaap_NumberOfOperatingSegments  
Percent of total sales from outside of United States 18.00%luna_InternationalSalesPercentofTotalSales 27.00%luna_InternationalSalesPercentofTotalSales