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) - Fair Value, Recurring - Fair Value, Inputs, Level 1 - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Money market funds $ 19,519 $ 7,232
U.S. treasuries 0 4,497
Total $ 19,519 $ 11,729