Stock-Based Compensation - Stock Option Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning Balance (in shares)	8,109,123
Granted (in shares)	6,538,646
Forfeited and expired (in shares)	(167,571)
Exercised (in shares)	0
Outstanding, Ending Balance (in shares)	14,480,198	8,109,123
Options vested and expected to vest (in shares)	2,992,326
Weighted-Average Exercise Price
Beginning Balance (in dollars per share)	$ 3.51
Granted (in dollars per share)	0.70
Forfeited and expired (in dollars per share)	2.66
Exercised (in dollars per share)	0
Ending Balance (in dollars per share)	2.25	$ 3.51
Options vested and expected to vest (in dollars per share)	$ 4.81
Weighted-Average Remaining Contractual Term (years) And Aggregate Intrinsic Value
Options Outstanding, Weighted Average Remaining Contractual Term (years)	9 years	8 years 9 months 18 days
Options Vested and Expected to Vest, Weighted Average Remaining Contractual Term (years)	7 years 7 months 6 days
Options Outstanding, Aggregate Intrinsic Value	$ 0	$ 0
Granted, Aggregate Intrinsic Value	$ 0
Forfeited and expired, Aggregate Intrinsic Value	$ 0
Exercised, Aggregate Intrinsic Value	$ 0
Options vested and expected to vest	$ 0
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant-Date Fair Value Options outstanding, Beginning	$ 2.96
Weighted-Average Grant-Date Fair Value Options outstanding, Granted	0.62
Weighted-Average Grant-Date Fair Value Options outstanding, Forfeited and expired	2.43
Weighted-Average Grant-Date Fair Value Options outstanding, Ending	1.91	$ 2.96
Weighted-Average Grant-Date Fair Value Options vested and expected to vest	4.14
Minimum
Weighted-Average Grant-Date Fair Value
Exercise price of options outstanding (in dollars per share)	0.67
Maximum
Weighted-Average Grant-Date Fair Value
Exercise price of options outstanding (in dollars per share)	$ 876

Weighted average grant-date fair value of options that were either forfeited or expired.

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Share-Based Compensation Arrangement By Share-based Payment Award, Options, Granted, Intrinsic Value

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Weighted average grant-date fair value for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Number of share options (or share units) exercised during the current period.

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