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Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Number of shares
Outstanding, Beginning of period	11,411,390
Granted	3,348,982
Forfeited	(2,256,315)
Expired	(2,264,006)
Outstanding, Ending of period	10,240,051		11,411,390
Vested and Exercisable at December 31, 2022	4,935,214
Vested or expected to vest at December 31, 2022	10,240,051
Weighted average exercise price per share
Outstanding, Beginning of period	$ 9.01
Granted	1.06
Forfeited	8.58
Expired	12.50
Outstanding, Ending of period	5.73		$ 9.01
Vested and Exercisable at December 31, 2022	8.43
Vested or expected to vest at December 31, 2022	$ 5.73
Weighted average remaining contractual term (years)
Outstanding	8 years 2 months 12 days		7 years 1 month 6 days
Vested and Exercisable at December 31, 2022	7 years 4 months 24 days
Vested or expected to vest at December 31, 2022	8 years 2 months 12 days
Number of share options unvested and exercisable during the period	3,426
Weighted average grant date fair value of options granted	$ 0.82	$ 2.52
Unrecognized compensation expense related to unvested stock option awards	$ 12.4
Stock option
Weighted average remaining contractual term (years)
Weighted average period for recognition	1 year 10 months 24 days

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Number of share options (or share units) unvested and exercisable under early exercise during the current period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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.

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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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