Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

WARRANT DERIVATIVE LIABILITY - Summary of Warrant Derivative Liability (Detail)

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WARRANT DERIVATIVE LIABILITY - Summary of Warrant Derivative Liability (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Warrant Derivative Liability - Summary Of Warrant Derivative Liability    
Number of Warrants, Opening Balance 19,592,392 28,969,670
Number of Warrants, Exercised (8,000,000)
Number of Warrants, Expired (637,111) (2,014,389)
Number of Warrants, Foreign exchange adjustment
Number of Warrants, Fair value adjustment
Number of Warrants, Ending Balance 18,955,281 18,955,281
Fair value derivative warrant liability, Opening Balance $ 22,589 $ 36,317
Fair value derivative warrant liability, Exercised (15,722)
Fair value derivative warrant liability, Items that were classified to net loss:    
Fair value derivative warrant liability, Expired (154) (274)
Fair value derivative warrant liability, Foreign exchange adjustment during the period 43
Fair value derivative warrant liability, Fair value adjustment during the period (5,400) (3,329)
Fair value derivative warrant liability, (Gain) loss on fair value of warrant derivative (5,554) (3,560)
Fair value derivative warrant liability, Ending Balance $ 17,035 $ 17,035