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Share-based Compensation - Summarizes Outstanding Simple and Performance Warrants (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Simple Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 3,424,600 9,815,000 6,129,866
Weighted average exercise price, Warrants outstanding | $ / shares $ 4.41 $ 4.01 $ 1.80
Weighted average contractual life, Warrants outstanding (years) 4 years 4 months 2 days 5 years 7 months 9 days  
Number of warrants, Warrants exercisable | shares 2,155,800 5,132,600  
Weighted average exercise price, Warrants exercisable | $ / shares $ 2.27 $ 1.29  
Weighted average contractual life, Warrants exercisable (years) 3 years 9 months 3 days 6 years  
Performance Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 1,672,000 5,798,822 7,094,822
Weighted average exercise price, Warrants outstanding | $ / shares $ 4.19 $ 2.66 $ 2.04
Number of warrants, Warrants exercisable | shares 1,053,867 4,456,422  
Weighted average exercise price, Warrants exercisable | $ / shares $ 1.98 $ 1.02  
$0.63 - $0.94 | Simple Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 1,009,400 4,019,000  
Weighted average exercise price, Warrants outstanding | $ / shares $ 0.74 $ 0.68  
Weighted average contractual life, Warrants outstanding (years) 3 years 6 months 14 days 5 years 7 months 13 days  
Number of warrants, Warrants exercisable | shares 1,009,400 3,635,000  
Weighted average exercise price, Warrants exercisable | $ / shares $ 0.74 $ 0.68  
Weighted average contractual life, Warrants exercisable (years) 3 years 6 months 14 days 5 years 7 months 9 days  
$0.63 - $0.94 | Performance Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 498,667 3,700,690  
Weighted average exercise price, Warrants outstanding | $ / shares $ 0.70 $ 0.64  
Number of warrants, Warrants exercisable | shares 370,667 3,546,022  
Weighted average exercise price, Warrants exercisable | $ / shares $ 0.72 $ 0.64  
$1.25 - $1.88 | Simple Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 400,000 560,000  
Weighted average exercise price, Warrants outstanding | $ / shares $ 1.56 $ 1.50  
Weighted average contractual life, Warrants outstanding (years) 3 years 7 months 2 days 10 years 2 months 4 days  
Number of warrants, Warrants exercisable | shares 400,000 560,000  
Weighted average exercise price, Warrants exercisable | $ / shares $ 1.56 $ 1.50  
Weighted average contractual life, Warrants exercisable (years) 3 years 7 months 2 days 10 years 2 months 4 days  
$1.25 - $1.88 | Performance Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 282,133 646,933  
Weighted average exercise price, Warrants outstanding | $ / shares $ 1.42 $ 1.52  
Number of warrants, Warrants exercisable | shares 247,467 381,334  
Weighted average exercise price, Warrants exercisable | $ / shares $ 1.40 $ 1.48  
$2.97 - $4.53 | Simple Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 527,200 1,232,000  
Weighted average exercise price, Warrants outstanding | $ / shares $ 3.05 $ 3.18  
Weighted average contractual life, Warrants outstanding (years) 3 years 7 months 20 days 5 years 7 months 13 days  
Number of warrants, Warrants exercisable | shares 455,200 848,000  
Weighted average exercise price, Warrants exercisable | $ / shares $ 3.01 $ 3.10  
Weighted average contractual life, Warrants exercisable (years) 3 years 6 months 14 days 4 years 11 months 12 days  
$2.97 - $4.53 | Performance Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 624,000 788,000  
Weighted average exercise price, Warrants outstanding | $ / shares $ 3.13 $ 3.09  
Number of warrants, Warrants exercisable | shares 397,333 490,666  
Weighted average exercise price, Warrants exercisable | $ / shares $ 3.10 $ 3.08  
$6.25 - $9.38 | Simple Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 1,318,400 3,462,400  
Weighted average exercise price, Warrants outstanding | $ / shares $ 6.33 $ 6.37  
Weighted average contractual life, Warrants outstanding (years) 5 years 2 months 4 days 4 years 6 months  
Number of warrants, Warrants exercisable | shares 275,200 80,000  
Weighted average exercise price, Warrants exercisable | $ / shares $ 6.61 $ 6.25  
Weighted average contractual life, Warrants exercisable (years) 5 years 1 month 6 days 4 years 5 months 8 days  
$6.25 - $9.38 | Performance Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 150,933 362,933  
Weighted average exercise price, Warrants outstanding | $ / shares $ 7.32 $ 6.97  
Number of warrants, Warrants exercisable | shares 38,400 38,400  
Weighted average exercise price, Warrants exercisable | $ / shares $ 6.25 $ 6.25  
$12.50 - $37.50 | Simple Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 169,600 541,600  
Weighted average exercise price, Warrants outstanding | $ / shares $ 22.28 $ 18.08  
Weighted average contractual life, Warrants outstanding (years) 6 years 5 months 26 days 7 years 10 months 13 days  
Number of warrants, Warrants exercisable | shares 16,000 9,600  
Weighted average exercise price, Warrants exercisable | $ / shares $ 20.60 $ 21.88  
Weighted average contractual life, Warrants exercisable (years) 4 years 6 months 9 years 18 days  
$12.50 - $37.50 | Performance Warrants      
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]      
Number of warrants, Warrants outstanding | shares 116,267 300,266  
Weighted average exercise price, Warrants outstanding | $ / shares $ 27.52 $ 23.72