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Intangible Assets - Gross Carrying Amount (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Gross Carrying Amount $ 6,286 $ 5,520
Accumulated amortization (2,036) (1,735)
Total 4,250 $ 3,785
Milestone payments $ 2,900  
Acquired technology    
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Weighted Average Amortization Period 9 years 9 years
Gross Carrying Amount $ 5,966 $ 5,200
Accumulated amortization (1,881) (1,593)
Total $ 4,085 $ 3,607
Customer relationships    
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Weighted Average Amortization Period 10 years 10 years
Gross Carrying Amount $ 260 $ 260
Accumulated amortization (110) (97)
Total $ 150 $ 163
Trademark    
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Weighted Average Amortization Period 5 years 5 years
Gross Carrying Amount $ 60 $ 60
Accumulated amortization (45) (45)
Total $ 15 $ 15