The Company and Basis of Presentation (Details) $ in Thousands			3 Months Ended						9 Months Ended
	Nov. 08, 2022 USD ($)	Sep. 12, 2022	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Sale of Stock
Reverse stock split, ratio		0.33
Cash			$ 6,356						$ 6,356		$ 16,387
Accumulated deficit			(91,119)						(91,119)		$ (81,828)
Net losses			$ 3,113	$ 3,303	$ 2,875	$ 3,461	$ 3,921	$ 3,324	$ 9,291	$ 10,706
Subsequent Event
Sale of Stock
Gross proceeds	$ 32,300
Private Placement [Member] | Subsequent Event
Sale of Stock
Gross proceeds	$ 15,000