Balance Sheet Components - Intangible Assets, net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets, net
Less: Accumulated amortization	$ (49,000)	$ (43,000)
Intangible assets, net	32,000	38,000
Amortization of Intangible Assets	6,000	5,000
License Agreement
Intangible Assets, net
Finite-Lived Intangible Assets, Gross	$ 81,000	$ 81,000