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Significant Customers, Concentrations of Credit Risk and Geographic Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) segment customer	Dec. 31, 2019 USD ($) customer
Significant Customers, Concentration of Credit Risk and Geographic Information
Number of operating segments | segment	1
Revenue, net	$ 6,888	$ 7,305
Allowance for doubtful accounts	$ 0	$ 0
Net revenue | Customer Concentration Risk | Customer A
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	17.00%	10.00%
Net revenue | Customer Concentration Risk | Customer B
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	16.00%	37.00%
Net revenue | Customer Concentration Risk | Customer C
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	12.00%	10.00%
Net revenue | Customer Concentration Risk | Customer D
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	10.00%	10.00%
Net revenue | Geographic Concentration Risk
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	$ 6,888	$ 7,305
Net revenue | Geographic Concentration Risk | United states
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	2,832	3,726
Net revenue | Geographic Concentration Risk | Asia and Middle East
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	3,575	2,949
Net revenue | Geographic Concentration Risk | Europe and other
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	$ 481	$ 630
Accounts receivable | Credit Concentration Risk
Significant Customers, Concentration of Credit Risk and Geographic Information
Number of customers | customer	2	4
Accounts receivable | Credit Concentration Risk | Customer One
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	47.00%	29.00%
Accounts receivable | Credit Concentration Risk | Customer Two
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	22.00%	20.00%
Accounts receivable | Credit Concentration Risk | Customer Three
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)		11.00%
Accounts receivable | Credit Concentration Risk | Customer Four
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)		11.00%
Assets | Geographic Concentration Risk
Significant Customers, Concentration of Credit Risk and Geographic Information
Total long-lived assets	$ 1,526	$ 1,501
Assets | Geographic Concentration Risk | United states
Significant Customers, Concentration of Credit Risk and Geographic Information
Total long-lived assets	1,194	648
Assets | Geographic Concentration Risk | Asia
Significant Customers, Concentration of Credit Risk and Geographic Information
Total long-lived assets	$ 332	$ 853

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Represents the number of customers.

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Amount of allowance for credit loss on accounts receivable.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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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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.

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