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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-based Compensation (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
shares
Non employee  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Maximum aggregate compensation and grant fair value of awards | $ $ 300
Equity Incentive Plans  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common stock authorized for issuance 684,494
Awards granted 0