Quarterly report pursuant to Section 13 or 15(d)

Other long-term assets (Schedule of Carrying Amounts Related to Acquired Intangible Assets) (Details)

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Other long-term assets (Schedule of Carrying Amounts Related to Acquired Intangible Assets) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Long-term Assets Schedule Of Carrying Amounts Related To Acquired Intangible Assets        
Patents at January 1, 2018, net     $ 509,649  
Additions     32,849  
Less: amortization expense $ 14,000 $ 53,000 43,828 $ 53,000
Patents at September 30, 2018, net $ 498,670   $ 498,670