Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Recurring | Fair Value, Inputs, Level 1    
Assets:    
Money market funds $ 23,202 $ 29,182