Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Components of Intangible Assets (Details)

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Intangible Assets - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Intangible assets consist of:      
Intangible assets, net $ 1,164   $ 1,181
Cost of goods sold 3,714 $ 2,712  
Amortization of Intangible Assets 26 $ 20  
Future amortization of license agreements      
Remainder of 2019 77    
2020 103    
2021 103    
2022 103    
2023 73    
Thereafter 98    
License Agreements      
Intangible assets consist of:      
Finite-lived intangible assets, gross 1,040   1,034
Less: accumulated amortization (577)   (553)
Intangible assets, net $ 463   481
License Agreements | Minimum      
Intangible assets consist of:      
Amortization period of intangible assets 17 years    
License Agreements | Maximum      
Intangible assets consist of:      
Amortization period of intangible assets 20 years    
Patents      
Intangible assets consist of:      
Finite-lived intangible assets, gross $ 758   755
Less: accumulated amortization (57)   (55)
Intangible assets, net $ 701   $ 700
Patents | Maximum      
Intangible assets consist of:      
Amortization period of intangible assets 20 years