Balance Sheet Components - Summary of the Company's Property and Equipment, Net Considered (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 3,493	$ 3,465
Less: accumulated depreciation and amortization	(2,564)	(2,636)
Property and equipment, net	929	829
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	131	131
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	265	226
Tools, Dies and Molds [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,614	2,652
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	153	150
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	187	168
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 138	$ 138