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RELATED PARTY TRANSACTIONS (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2016
USD ($)
item
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
BKF Capital          
RELATED PARTY TRANSACTIONS          
Number of offices leased out | item 1        
Revenue from related parties per month $ 1        
Revenue from related parties   $ 3 $ 3 $ 9 $ 7
Qualstar          
Due to Qualstar          
Paid to Qualstar   10 14 33 42
Due to Qualstar, beginning balance   3 4 6 2
Billed to Interlink by Qualstar   10 15 30 45
Due to Qualstar, end balance   3 5 3 5
Due from Qualstar          
Reimbursed from Qualstar   9 3 11 18
Due from Qualstar, beginning balance   4 1   5
Billed to Qualstar by Interlink   $ 5 $ 2 $ 11 $ 13