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Summary of Significant Unobservable Inputs Used in Fair Value Measurements Categorized Within Level 3 of Fair Value Hierarchy (Detail) - Level 3 - Option Pricing Method
 12 Months Ended
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Volatility 41.0
Discount for Lack of Marketability (“DLOM”)  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Sensitivity of the input to fair value 1% increase or decrease in DLOM would result in a variation in the fair value by approximately $120 thousand.
Volatility  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Sensitivity of the input to fair value 1% increase or decrease in volatility would result in a variation in the fair value by less than $30 thousand.
Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Discount for lack of marketability (“DLOM”) 13.50
Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Discount for lack of marketability (“DLOM”) 26.00