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Stock-Based Compensation; Changes in Equity (Details 1) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Shares, Outstanding at the end of period (in shares) 128,469  
Shares under Warrant, Exercisable (in shares) 100,788  
Weighted Average Exercise Price, Outstanding at the end of period (in dollars per share) $ 5.23  
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 5.21  
Weighted Average Remaining Contractual Life, Outstanding (in years) 1 year 3 months 18 days  
Weighted Average Remaining Contractual Life, Exercisable (in years) 9 months 18 days  
Aggregate Intrinsic Value Outstanding (in dollars) $ 0  
Aggregate Intrinsic Value, Exercisable (in dollars) $ 0  
Warrant [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Shares, Outstanding, beginning of period (in shares) 216,723  
Shares under Warrant, Granted (in shares) 0  
Shares under Warrant, Cancelled (in shares) 0  
Shares under Warrant, Exercised (in shares) 140,048  
Shares, Outstanding at the end of period (in shares) 76,675 216,723
Shares under Warrant, Exercisable (in shares) 76,675  
Weighted Average Exercise Price, Outstanding, beginning of period (in dollars per share) $ 2.48  
Weighted Average Exercise Price, Granted (in dollars per share) 0  
Weighted Average Exercise Price, Cancelled (in dollars per share) 0  
Weighted Average Exercise Price, Exercised (in dollars per share) 0.01  
Weighted Average Exercise Price, Outstanding at the end of period (in dollars per share) 7.00 $ 2.48
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 7.00  
Weighted Average Remaining Contractual Life, Outstanding (in years) 1 year 9 months 18 days 4 years 5 months 26 days
Weighted Average Remaining Contractual Life, Exercisable (in years) 1 year 9 months 18 days  
Aggregate Intrinsic Value, Exercised (in dollars) $ 642,820  
Aggregate Intrinsic Value Outstanding (in dollars) 0 $ 817,880
Aggregate Intrinsic Value, Exercisable (in dollars) $ 0