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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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