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Summary of Significant Accounting Policies - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financial liabilities carried at fair value:    
Term loan derivative liability   $ 196
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]    
Financial assets carried at fair value:    
Money market funds $ 35,492 44,095
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Term Loan Derivative Liability [Member]    
Financial liabilities carried at fair value:    
Term loan derivative liability $ 162 $ 196