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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in Accumulated Other Comprehensive Income (Loss)    
Beginning Balance $ (750) $ (418)
Other comprehensive loss before reclassifications (871) 94
Amounts reclassified from accumulated other comprehensive loss 215 10
Net current period change in accumulated other comprehensive loss (656) 104
Ending Balance (1,406) (314)
Cumulative Translation Adjustment    
Changes in Accumulated Other Comprehensive Income (Loss)    
Beginning Balance (61) (204)
Other comprehensive loss before reclassifications 12 97
Net current period change in accumulated other comprehensive loss 12 97
Ending Balance (49) (107)
Accumulated Net Unrealized Investment Gain Loss    
Changes in Accumulated Other Comprehensive Income (Loss)    
Beginning Balance (689) (214)
Other comprehensive loss before reclassifications (883) (3)
Amounts reclassified from accumulated other comprehensive loss 215 10
Net current period change in accumulated other comprehensive loss (668) 7
Ending Balance $ (1,357) $ (207)