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Summary of Gain Recognized in Consolidated Statements of Operations Due to Changes in Fair Value of Warrant (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Warrant | Level 3  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Gain from changes in the fair value of level 3 investments $ 220