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RELATED-PARTY TRANSACTIONS - Transactions with The Palisades Group (Details) - USD ($) |  |  | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 06, 2015 | Jul. 01, 2013 | May 05, 2016 | Dec. 31, 2013 | Jun. 30, 2016 | Jun. 27, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties | $ 263,000 |  |  |  |  |  |  |  |
COR Securities Holding, Inc. (CORSHI) | Rent Payments Reimbursement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties |  |  |  | $ 40,000 |  |  |  |  |
COR Securities Holding, Inc. (CORSHI) | Security Deposit |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties |  |  |  | $ 34,000 |  |  |  |  |
COR Securities Holding, Inc. (CORSHI) | Intercompany Transaction |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties |  |  |  |  |  | $ 34,000 |  |  |
COR Securities Holding, Inc. (CORSHI) | Leasing Costs Payments |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties |  |  |  |  |  | $ 58,000 |  |  |
Subsidiaries | Immediate Family Member of Chief Executive Officer, Brother | Consulting Agreement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Consulting agreement term |  | 5 years |  |  |  |  |  |  |
Consulting agreement minimum payment |  | $ 30,000 |  |  |  |  |  |  |
Consulting agreement payment |  | $ 600,000 |  |  |  |  |  |  |
Expenses from transactions with related parties |  |  | $ 0 |  |  |  | $ 30,000 | $ 1,200,000 | $ 121,000
Written notice period for agreement termination |  |  |  |  | 30 days |  |  |  |

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