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Equity-Based Compensation - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity-based compensation
Equity-based compensation expense	$ 11,175	$ 7,972
Acceleration of equity awards expense		600
Modification of equity awards expense	1,500	100
Research and development expense
Equity-based compensation
Equity-based compensation expense	3,554	2,425
General and administrative expense
Equity-based compensation
Equity-based compensation expense	$ 7,621	$ 5,547

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
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-Topic 718
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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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