Annual report pursuant to Section 13 and 15(d)

Outstanding Warrants (Details)

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Outstanding Warrants (Details) - Warrant
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Class of Warrant or Right [Line Items]    
Expected life (in years) 5 years 10 years
Risk-free interest rate 2.04%  
Volatility 38.10% 37.00%
Dividend yield 0.00% 0.00%
Minimum    
Class of Warrant or Right [Line Items]    
Risk-free interest rate   1.00%
Maximum    
Class of Warrant or Right [Line Items]    
Risk-free interest rate   1.77%