GM Securities Purchase Agreement (Details)		12 Months Ended
	Dec. 16, 2022 USD ($) d $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 31, 2020
Obligation
Loss on issuance of GM Securities Purchase Agreement		$ (4,116,000)	$ 0
Secured Convertible Notes		11,390,000	0
Fair value of warrants		594,000	12,650,000
Gain on fair value of GM Securities Purchase Agreement		1,883,000	0
Warrant liability - GM Securities Purchase Agreement		343,000	0
Convertible Debt
Obligation
Proceeds from issuance of convertible loans, net of transaction costs		$ 0	$ 16,222,000
Debt instrument, interest rate (as a percent)				8.00%
General Motors Holdings, LLC
Obligation
Beneficial owner conversion limitation, outstanding common shares (as a percent)	19.99%
General Motors Holdings, LLC | GM Securities Purchase Agreement
Obligation
Class of warrant or right, number of securities called by warrants or rights (in shares) | shares	1,190,476
Exercise price (in dollars per share) | $ / shares	$ 0.75112
General Motors Holdings, LLC | Convertible Debt | Secured Convertible Note
Obligation
Aggregate principal amount	$ 10,000,000
Proceeds from issuance of convertible loans, net of transaction costs	$ 9,500,000
Debt instrument, interest rate (as a percent)	5.00%
Optional redemption period | d	20
Stock price trigger (as a percent)	120.00%
Conversion price (in dollars per share) | $ / shares	$ 0.80323