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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Merger Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
Aug. 31, 2019
Jun. 02, 2018
Vical Warrants [Member]    
Business Acquisition [Line Items]    
Warrants converted (in shares)   891,582
Exercise price (in usd per share)   $ 0.07
Vical    
Business Acquisition [Line Items]    
Common stock issued in recapitalization (in shares) 3,367,988  
Net acquired tangible assets $ 36,093