Quarterly report pursuant to Section 13 or 15(d)

Other long-term assets (Narrative) (Details)

v3.8.0.1
Other long-term assets (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Future amortization        
2018 $ 71,000   $ 71,000  
2019 71,000   71,000  
2020 71,000   71,000  
2021 71,000   71,000  
2022 71,000   71,000  
Patent impairment charges $ 32,000 $ 200,000