Balance Sheet Components - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Depreciation expense			$ 300,000	$ 200,000	$ 100,000
Goodwill	$ 2,333,000	$ 2,333,000	2,333,000	2,333,000
Goodwill, accumulated impairment loss	0		0
Goodwill acquired			0	0
Goodwill disposed of			0
Goodwill, impairment loss	$ 0	$ 0
Amortization expense related to intangibles			$ 100,000	$ 100,000	$ 100,000