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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment customer	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) customer
Significant Customers, Concentrations of Credit Risk and Geographic Information
Number of operating segments | segment			1
Revenue, net	$ 2,898,000	$ 4,049,000	$ 6,022,000	$ 7,327,000
Allowance for doubtful accounts	0		0		$ 0
Net revenue
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	$ 2,898,000	$ 4,049,000	$ 6,022,000	$ 7,327,000
Net revenue | Customer Concentration Risk | Customer A
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)	24.00%	23.00%	20.00%	27.00%
Net revenue | Customer Concentration Risk | Customer B
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)	16.00%	13.00%	15.00%
Net revenue | Customer Concentration Risk | Customer C
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)		11.00%
Net revenue | Geographic Concentration Risk | United States
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	$ 1,403,000	$ 1,947,000	$ 2,848,000	$ 4,100,000
Net revenue | Geographic Concentration Risk | Asia and Middle East
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	478,000	1,128,000	1,207,000	1,954,000
Net revenue | Geographic Concentration Risk | Europe and other
Significant Customers, Concentrations of Credit Risk and Geographic Information
Revenue, net	1,017,000	$ 974,000	$ 1,967,000	$ 1,273,000
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)			27.00%		35.00%
Accounts receivable | Credit Concentration Risk | Customer Two
Significant Customers, Concentrations of Credit Risk and Geographic Information
Concentration risk (as a percent)			15.00%		16.00%
Assets
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	5,946,000		$ 5,946,000		$ 5,734,000
Assets | Geographic Concentration Risk | United States
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	1,165,000		1,165,000		733,000
Assets | Geographic Concentration Risk | Europe
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	4,391,000		4,391,000		4,784,000
Assets | Geographic Concentration Risk | Asia
Significant Customers, Concentrations of Credit Risk and Geographic Information
Total long-lived assets	$ 390,000		$ 390,000		$ 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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