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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Qualstar
Due from Qualstar
Due from Qualstar, beginning balance	$ 115	$ 1	$ 52	$ 24
Billed (or accrued) to Qualstar by Interlink	266	126	475	254
Paid by Qualstar to Interlink	(365)	(79)	(511)	(230)
Due from Qualstar, end balance	16	48	16	48
Due to Qualstar
Due to Qualstar, beginning balance	8	7	34	12
Billed (or accrued) to Interlink by Qualstar	23	20	54	53
Paid by Interlink to Qualstar	(30)	(20)	(87)	(58)
Due to Qualstar, end balance	1	7	1	7
BKF Capital
Due to Qualstar
Revenue from related parties	6	0
Receivable from related party	$ 7	$ 0	$ 7	$ 0

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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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