Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

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STOCK-BASED COMPENSATION - Narrative (Details) - Options - shares
1 Months Ended
Aug. 31, 2020
Sep. 30, 2020
2020 Omnibus Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock reserved for future issuance (in shares) 4,500,000  
Options outstanding (in shares)   3,347,065
Shares available for grant (in shares)   1,997,623
2009 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding (in shares)   1,319,452
Shares available for grant (in shares)   0
Vical Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding (in shares)   281,253
Shares available for grant (in shares)   0