Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Property Plant And Equipment [Line Items]
Property plant and equipment basis of valuation	cost
Property plant and equipment depreciation methods	the straight-line method over the estimated useful lives of the assets
Depreciation expense	$ 779	$ 461
Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	2 years
Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property plant and equipment estimated useful lives	shorter of their estimated useful lives or the related lease term