Condensed Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Total property and equipment, cost	$ 1,601	$ 1,360
Less: accumulated depreciation and amortization	(284)	(101)
Total property and equipment, net	1,317	1,259
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment, cost	1,115	1,112
Computer Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, cost	198	139
Office Furniture and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, cost	$ 288	$ 109