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Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended
		May 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Proceeds from sale of stock	[1]				$ 17,279
Director
Related Party Transaction [Line Items]
Sale of stock, number of shares issued (in shares)		447,761
Sale of stock, price per share (in dollars per share)		$ 1.34
Proceeds from sale of stock		$ 600
Affiliated Entity
Related Party Transaction [Line Items]
Research and development expense			$ 0	$ 300		$ 0	$ 800
[1] Net of expenses of $0.6 million, and fair value of warrants issued as a transaction advisory fee as of the date of issuance of $0.4 million.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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-Name Accounting Standards Codification
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