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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) customer segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) customer
Significant Customers, Concentrations of Credit Risk and Geographic Information
Number of operating segments | segment	1
Revenue, net	$ 3,124,000	$ 3,278,000
Allowance for doubtful accounts	0		$ 0
Net revenue
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	$ 3,124,000	$ 3,278,000
Net revenue | Customer Concentration Risk | Customer A
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)	16.00%	32.00%
Net revenue | Customer Concentration Risk | Customer B
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)	17.00%
Net revenue | Geographic Concentration Risk | United States
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	$ 1,445,000	$ 2,153,000
Net revenue | Geographic Concentration Risk | Asia and Middle East
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	729,000	826,000
Net revenue | Geographic Concentration Risk | Europe and other
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	$ 950,000	$ 299,000
Accounts receivable | Credit Concentration Risk
Significant Customers, Concentrations of Credit Risk and Geographic Information
Number of customers | customer	2		2
Accounts receivable | Credit Concentration Risk | Customer One
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)	24.00%		35.00%
Accounts receivable | Credit Concentration Risk | Customer Two
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)	19.00%		16.00%
Assets
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	$ 5,421,000		$ 5,734,000
Assets | Geographic Concentration Risk | United States
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	674,000		733,000
Assets | Geographic Concentration Risk | Europe
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	4,565,000		4,784,000
Assets | Geographic Concentration Risk | Asia
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	$ 182,000		$ 217,000

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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