Balance Sheet Components - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,849	$ 1,849
Accumulated Amortization	(1,449)	(1,325)
Net Carrying Value	400	524
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,658	1,658
Accumulated Amortization	(1,299)	(1,188)
Net Carrying Value	359	470
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	191	191
Accumulated Amortization	(150)	(137)
Net Carrying Value	$ 41	$ 54