Balance Sheet Details - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Preclinical studies	$ 1,311	$ 844
Professional fees	1,696	397
Other accrued expenses	290	64
Total	$ 3,297	$ 1,305

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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