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Warrant Derivative - Summary of Assumptions Used in the Black Scholes Option Pricing Model for Warrants (Details)
12 Months Ended
Dec. 31, 2019
year
$ / shares
Aug. 16, 2019
year
$ / shares
Dec. 31, 2019
year
$ / shares
Dec. 31, 2018
year
Dec. 31, 2017
year
Disclosure of fair value measurement of liabilities [line items]          
Risk-free interest rate     1.62% 2.02% 1.18%
Expected hold period to exercise | year     3.0 3.0 3.0
Volatility in the price of the Company's shares     97.90% 81.15% 90.73%
Warrants          
Disclosure of fair value measurement of liabilities [line items]          
Fair value per warrant (usd per share) | $ / shares $ 3.89 $ 0.27 $ 3.89    
Underlying share price (usd per share) | $ / shares $ 4.76 $ 0.54      
Risk-free interest rate   1.42% 1.59%    
Expected hold period to exercise | year 1 4      
Volatility in the price of the Company's shares 90.00% 82.00%      
Dividend yield 0.00% 0.00%