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Intangibles - Amortization of Intangible Assets Acquired (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Capitalized patent costs $ 6,722 $ 6,183
Intangible assets acquired:    
Gross intangible assets 9,992 9,453
Accumulated amortization (3,269) (2,733)
Intangibles, net 6,723 6,720
Purchased patents and intellectual property [Member]    
Intangible assets acquired:    
Intangible assets amount 250 250
Existing technology [Member]    
Intangible assets acquired:    
Intangible assets amount 1,560 1,560
Customer relationships [Member]    
Intangible assets acquired:    
Intangible assets amount 290 290
Backlog [Member]    
Intangible assets acquired:    
Intangible assets amount 760 760
Tradenames [Member]    
Intangible assets acquired:    
Intangible assets amount 290 290
Non-solicitation agreements [Member]    
Intangible assets acquired:    
Intangible assets amount $ 120 $ 120