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Summary of Significant Accounting Policies - Segments and geographical information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Revenue based upon the customers country of origin
Number of operating segments | segment	1		1
Total revenue, net	$ 2,275	$ 980	$ 5,430	$ 7,268
United States
Revenue based upon the customers country of origin
Total revenue, net	$ 1,962	916	$ 4,361	5,813
Percentage of assets	100.00%		100.00%
International
Revenue based upon the customers country of origin
Total revenue, net	$ 313	$ 64	$ 1,069	$ 1,455

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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