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Share-Based Compensation - Restricted Stock Units (Details) - Unvested restricted stock units - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Number of shares
Unvested balance, Beginning	1,229,166
Granted	195,000
Vested	(98,042)
Forfeited	(179,625)
Unvested balance, Ending	1,146,499
Weighted average grant date fair value
Unvested balance, Weighted average grant date fair value, Beginning	$ 2.58	$ 2.98
Granted, Weighted average grant date fair value	1.01
Vested, Weighted average grant date fair value	5.82
Forfeited, Weighted average grant date fair value	2.13
Unvested balance, Weighted average grant date fair value, Ending	$ 2.58
Total unrecognized expense	$ 1.5
Weighted average period for recognition	1 year 1 month 6 days

X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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