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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]    
Accumulated Amortization $ (1,410) $ (1,213)
Net Carrying Amount 2,957  
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]    
Indefinite-lived capitalized patents and license rights 291 291
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Amount 4,658 4,658
Net book value $ 3,248 3,445
Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 2 years  
Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 15 years  
Patents and license rights    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 1,669 1,669
Accumulated Amortization (625) (564)
Net Carrying Amount $ 1,044 $ 1,105
Patents and license rights | Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 7 years 7 years
Patents and license rights | Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 12 years 12 years
Customer relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 1,896 $ 1,896
Accumulated Amortization (500) (381)
Net Carrying Amount $ 1,396 $ 1,515
Customer relationships | Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 4 years 4 years
Customer relationships | Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 10 years 10 years
510(k) authorization    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 567 $ 567
Accumulated Amortization (128) (118)
Net Carrying Amount $ 439 $ 449
Estimated Useful Lives 15 years 15 years
Developed technology    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 62 $ 62
Accumulated Amortization (36) (34)
Net Carrying Amount $ 26 $ 28
Estimated Useful Lives 10 years 10 years
Capitalized software development costs    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 98 $ 98
Accumulated Amortization (98) (98)
Net Carrying Amount $ 0 $ 0
Estimated Useful Lives 2 years 2 years
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 75 $ 75
Accumulated Amortization (23) (18)
Net Carrying Amount $ 52 $ 57
Other | Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 2 years 2 years
Other | Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated Useful Lives 5 years 5 years