Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Components of Intangible Assets (Details)

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Intangible Assets - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible assets consist of:      
Intangible assets, net $ 1,181 $ 937  
Cost of goods sold 12,923 9,311 $ 6,467
Amortization of Intangible Assets 77 79 $ 75
Future amortization of license agreements      
2019 75    
2020 75    
2021 75    
2022 75    
2023 75    
2024 75    
After 2024 113    
License Agreements      
Intangible assets consist of:      
Finite-lived intangible assets, gross 1,034 1,008  
Less: accumulated amortization (553) (486)  
Intangible assets, net $ 481 522  
License Agreements | Minimum      
Intangible assets consist of:      
Estimated useful life 17 years    
License Agreements | Maximum      
Intangible assets consist of:      
Estimated useful life 20 years    
Patents      
Intangible assets consist of:      
Finite-lived intangible assets, gross $ 755 460  
Less: accumulated amortization (55) (45)  
Intangible assets, net $ 700 $ 415  
Amortization period of intangible assets 3 years    
Cost of goods sold $ 22    
Pending and issued license costs 755    
Pending and issued license costs amortized over period of 20 years $ 132    
Patents | Maximum      
Intangible assets consist of:      
Amortization period of intangible assets 20 years