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Rye Patch Acquisition - Summary of Replacement Options (Details)
12 Months Ended
May 25, 2018
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Business Combinations [Line Items]      
Risk-free interest rate   2.20% 1.20%
Annualized volatility   47.40% 75.40%
Dividend rate   0.00% 0.00%
Rye Patch [member] | Options [Member]      
Disclosure Of Business Combinations [Line Items]      
Forfeiture rate 2.20%    
Dividend rate 0.00%    
Rye Patch [member] | Minimum [Member] | Options [Member]      
Disclosure Of Business Combinations [Line Items]      
Risk-free interest rate 1.90%    
Expected life of warrants 2 months 12 days    
Annualized volatility 25.40%    
Rye Patch [member] | Maximum [Member] | Options [Member]      
Disclosure Of Business Combinations [Line Items]      
Risk-free interest rate 2.30%    
Expected life of warrants 9 years 8 months 12 days    
Annualized volatility 50.40%