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Share-Based Compensation - Schedule of expense related to stock options (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	$ 321	$ 6	$ 344	$ 13
Share-Based Compensation Expense
Unrecognized stock based compensation	9,400		$ 9,400
Unrecognized stock-based compensation weighted-average period			3 years 8 months 12 days
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	101	2	$ 113	2
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	$ 220	$ 4	$ 231	$ 11

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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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.

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