Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and cash equivalents	$ 3,342		$ 3,342		$ 15,557
Fair value of warrants	17		17		9
Money market funds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents - money market funds	0		0		1,681
Cash and cash equivalents	$ 0		$ 0		$ 1,681
2021 Private Placement Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value price of warrants (in dollars per share)	$ 0.02		$ 0.02		$ 0.01
Fair value of warrants	$ 11		$ 11		$ 6
2021 PIPE Subscription Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value price of warrants (in dollars per share)	$ 0.02		$ 0.02		$ 0.01
Fair value of warrants	$ 6		$ 6		$ 3
2026 Notes | Convertible notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivative liability	59		59		$ 56
Gain on fair value of derivative liability	$ 0	$ 200		$ 6,900
Loss on fair value of derivative liability			$ 3