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Share-based Payments - Summary of Outstanding Warrants (Details) - Warrants - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average exercise price (in dollars per share) $ 0.25 $ 0.26 $ 0.26
Number of warrants (in shares) 7,987,349 18,066,662 25,457,623
May 13 – 27, 2016      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average exercise price (in dollars per share) $ 0.25    
Number of warrants (in shares) 7,987,349