Balance Sheets Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 04, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accrued payroll and related benefits	$ 3,963		$ 1,880
Price adjustment and other revenue reserves	1,789		1,222
Short term lease liability	1,243		1,874
Other accrued expenses	3,097		3,466
Total accrued expenses and other current liabilities	$ 10,092	$ 400	$ 8,442