The Company and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Maximum specific allowance as percentage of invoice value for problematic customer balances		100.00%
Allowance for doubtful accounts receivable		$ 41,000	$ 0
Inventory reserves		$ 100	100
Impairment of goodwill	$ 400		420
Goodwill balance	$ 0
Payment terms		The Company sells its products both directly to customers and through distributors generally under agreements with payment terms typically 60 days or less
Deferred revenue, revenue recognized		$ 200	$ 300
Period payments due from customers		60 days
Revenue, practical expedient, financing component		true
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment		3 years
Estimated useful lives of long-lived assets		3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment		5 years
Estimated useful lives of long-lived assets		7 years