Stock-Based Compensation - Summary of Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Number of Shares
Outstanding, beginning balance (in shares)	24,435
Granted (in shares)	14,100
Exercised (in shares)	0
Cancelled (in shares)	(11,687)
Outstanding, ending balance (in shares)	26,848	24,435
Number of shares, Exercisable (in shares)	7,680
Number of shares, Vested or expected to vest (in shares)	26,848
Weighted Average Exercise Price
Outstanding beginning balance (in dollars per share)	$ 0.32
Granted (in dollars per share)	0.05
Exercised (in dollars per share)	0
Cancelled (in dollars per share)	0.42
Outstanding ending balance (in dollars per share)	0.14	$ 0.32
Weighted average exercise price, Exercisable (in dollars per share)	0.36
Weighted average exercise price, Vested or expected to vest (in dollars per share)	$ 0.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding balance, weighted average remaining contract term (in years)	8 years 10 months 24 days	4 years 4 months 24 days
Options exercisable, weighted average remaining contract term (in years)	7 years
Options Vested or expected to vest, weighted average remaining contract term (in years)	8 years 10 months 24 days
Outstanding, aggregate intrinsic value	$ 230	$ 6
Options exercisable, aggregate intrinsic value	64
Options Vested or expected to vest, aggregate intrinsic value	$ 230