Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants - Warrant liability (Details)

v3.19.3
Stock Warrants - Warrant liability (Details) - $ / shares
1 Months Ended 12 Months Ended
Oct. 10, 2014
Nov. 18, 2016
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Closing stock price $ 61.25   $ 0.56
Expected dividends 0.00%   0.00%
Expected volatility 95.00%   110.00%
Risk free interest rate 1.39%   2.60%
Expected life of warrant 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 dividends   0.00% 0.00%
Expected volatility   85.00% 92.50%
Risk free interest rate   1.58% 2.50%
Expected life of warrant   4 years 1 year 10 months 24 days