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Goodwill and Intangible Assets, Net - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]    
Gross $ 62,656 $ 61,766
Accumulated Amortization (37,076) (32,725)
Net 25,580 29,041
Gross value of fully amortized intangible assets 6,800 6,000
Distribution rights    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 333 344
Accumulated Amortization (182) (165)
Net 151 179
Patents    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 14,194 13,250
Accumulated Amortization (5,502) (5,310)
Net 8,692 7,940
Trademarks and trade names    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 2,786 2,786
Accumulated Amortization (1,823) (1,594)
Net 963 1,192
Developed and core technology    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 12,560 12,560
Accumulated Amortization (7,583) (6,071)
Net 4,977 6,489
Capitalized software development costs    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 249 142
Accumulated Amortization (131) (77)
Net 118 65
Customer relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 32,534 32,534
Accumulated Amortization (21,855) (19,395)
Net 10,679 13,139
Order backlog    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross 0 150
Accumulated Amortization 0 (113)
Net $ 0 $ 37