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Stockholders' Equity (Details 3) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of year 79,890 134,150 150,138
Granted 147,088
Exercised
Expired/cancelled (149,588) (133,150) (15,988)
Outstanding, end of year 77,390 79,890 134,150
Exercisable, end of year 77,390 800  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding, beginning of year $ 94.51 $ 85.22 $ 67.99
Granted 0.98
Exercised
Expired/cancelled 91.43 82.26
Outstanding, end of year 95.27 94.51 $ 85.22
Exercisable, end of year $ 95.27 $ 75.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Life [Roll Forward]      
Outstanding, beginning of year 3 years 7 months 6 days    
Granted/vested 9 years 6 months    
Outstanding, end of year 3 years 7 months 6 days    
Exercisable, end of year 3 years 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]      
Outstanding. beginning of year    
Exercised    
Outstanding. ending of year  
Exercisable, end of year