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Share-based Compensation - Summary of Changes in Simple and Performance Warrants (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Simple Warrants    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]    
Beginning balance | shares 9,815,000 6,129,866
Granted | shares   4,795,200
Forfeited | shares (6,390,400) (733,866)
Exercised | shares   (376,200)
Ending balance | shares 3,424,600 9,815,000
Weighted average exercise price, beginning balance | $ / shares $ 4.01 $ 1.80
Weighted average exercise price, Granted | $ / shares   6.32
Weighted average exercise price, Forfeited | $ / shares 3.79 2.32
Weighted average exercise price, Exercised | $ / shares   0.85
Weighted average exercise price, ending balance | $ / shares $ 4.41 $ 4.01
Performance Warrants    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]    
Beginning balance | shares 5,798,822 7,094,822
Granted | shares   723,200
Forfeited | shares (4,126,822) (366,400)
Exercised | shares   (1,652,800)
Ending balance | shares 1,672,000 5,798,822
Weighted average exercise price, beginning balance | $ / shares $ 2.66 $ 2.04
Weighted average exercise price, Granted | $ / shares   12.23
Weighted average exercise price, Forfeited | $ / shares 2.04 1.21
Weighted average exercise price, Exercised | $ / shares   0.63
Weighted average exercise price, ending balance | $ / shares $ 4.19 $ 2.66