Quarterly report pursuant to Section 13 or 15(d)

ORGANIZATION AND NATURE OF OPERATIONS - Narrative (Details)

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ORGANIZATION AND NATURE OF OPERATIONS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]              
Net loss $ 11,149 $ 9,005 $ 5,119 $ 4,103 $ 20,154 $ 9,222  
Net cash used in operating activities         20,205 $ 11,290  
Cash and cash equivalents 24,408       24,408   $ 30,115
Accumulated deficit $ 126,047       $ 126,047   $ 105,893