Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Warrants - Assumptions (Details)

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Stock-Based Compensation and Warrants - Assumptions (Details) - $ / shares
1 Months Ended 12 Months Ended
Oct. 10, 2014
Oct. 10, 2014
Nov. 18, 2016
Dec. 31, 2018
Oct. 10, 2018
Dec. 26, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Closing stock price $ 61.25 $ 61.25   $ 0.56 $ 0.88 $ 18.55
Expected volatility 95.00%     110.00%    
Risk free interest rate 1.39%     2.60%    
Expected life of warrant (years) 5 years 5 years   9 months 15 days    
Series A Warrants [Member]            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Closing stock price     $ 31.15 $ 0.56    
Expected volatility     85.00% 92.50%    
Risk free interest rate     1.58% 2.50%    
Expected life of warrant (years)     4 years 1 year 10 months 24 days