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
Mar. 31, 2018
Mar. 31, 2017
Other Long-term Assets Schedule Of Carrying Amounts Related To Acquired Intangible Assets Details    
Patents at January 1, 2018, net $ 509,649  
Additions 24,074  
Less: amortization expense 14,610 $ 18,000
Patents at March 31, 2018, net $ 519,113