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Composition of Certain Financial Statement Captions - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property and Equipment, net [Abstract]    
Office and computer equipment $ 1,518 $ 1,279
Leasehold improvements 1,682 1,682
Property and equipment, gross 3,200 2,961
Less accumulated depreciation (1,021) (662)
Property and equipment, net $ 2,179 $ 2,299