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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Net Assets Acquired (Details) - Vical
$ in Thousands
Aug. 31, 2019
USD ($)
Business Acquisition [Line Items]  
Cash and cash equivalents $ 13,017
Marketable securities 23,959
Prepaid expenses and other current assets 1,474
Accrued liabilities (2,357)
Net acquired tangible assets $ 36,093