Balance Sheet Details - Schedule of Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,409	$ 1,317
Less: accumulated depreciation and amortization	(717)	(331)
Total property, plant and equipment, net	692	986
Computer Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	587	516
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	763	747
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 59	$ 54