Equity Incentive Plans - Summary of Total Stock-based Compensation Expense Recorded Related to Share-based Payment Awards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation	$ 58	$ 48	$ 166	$ 213
Research and Development Expense [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation	23	24	68	82
Selling and Marketing Expense [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation		(2)	1	1
General and Administrative Expense [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation	$ 35	$ 26	$ 97	$ 130