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, 2020
Mar. 31, 2019
Dec. 31, 2019
Intangible assets consist of:      
Intangible assets, net $ 1,598   $ 1,515
Amortization of intangible assets 36 $ 26  
Future amortization of patents and license agreements      
Intangible assets, net 1,598   1,515
License Agreements      
Intangible assets consist of:      
Finite-lived intangible assets, gross 1,074   1,067
Less: accumulated amortization (672)   (647)
Intangible assets, net 402   420
Future amortization of patents and license agreements      
Intangible assets, net $ 402   420
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    
Trademarks      
Intangible assets consist of:      
Intangible assets, net $ 341   334
Future amortization of patents and license agreements      
Intangible assets, net 341   334
Patents      
Intangible assets consist of:      
Finite-lived intangible assets, gross 950   845
Less: accumulated amortization (95)   (84)
Intangible assets, net 855   761
Future amortization of patents and license agreements      
Intangible assets, net $ 855   $ 761
Patents | Maximum      
Intangible assets consist of:      
Amortization period of intangible assets 20 years    
Patents And License Agreements      
Intangible assets consist of:      
Intangible assets, net $ 1,257    
Future amortization of patents and license agreements      
2020 (excluding three months ended March 31, 2020) 114    
2021 152    
2022 151    
2023 103    
2024 52    
Thereafter 685    
Intangible assets, net $ 1,257