Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
BKF Capital
Due from related party
Due from related party, beginning balance	$ 6	$ 1	$ 0	$ 0
Billed (or accrued) to related party by Interlink	33	3	46	4
Paid by related party to Interlink	(32)	(4)	(39)	(4)
Due from related party, end balance	7	0	7	0
Due to related party
Due to related party, beginning balance	0	0	0	0
Billed (or accrued) to Interlink by related party	30	0	30	0
Paid by Interlink to related party	(30)	0	(30)	0
Due to related party, end balance	0	0	0	0
Qualstar
Due from related party
Due from related party, beginning balance	16	48	52	24
Billed (or accrued) to related party by Interlink	217	127	692	381
Paid by related party to Interlink	(217)	(162)	(728)	(392)
Due from related party, end balance	16	13	16	13
Due to related party
Due to related party, beginning balance	1	7	34	12
Billed (or accrued) to Interlink by related party	22	18	76	71
Paid by Interlink to related party	(23)	(20)	(110)	(78)
Due to related party, end balance	$ 0	$ 5	$ 0	$ 5

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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The increase (decrease) during the reporting period in the obligations due for goods and services provided by the following types of related parties: a parent company and its subsidiaries, subsidiaries of a common parent, an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in the amount due to the reporting entity for good and services provided to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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Payments of cash to suppliers for goods and services during the current period.

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Cash received for fees during the current period. This element excludes cash proceeds from license fees.

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