SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss)
Beginning Balance	$ (433)	$ (115)	$ 125
Other comprehensive (loss) income before reclassifications	(98)	(350)	(200)
Amounts reclassified from accumulated other comprehensive loss	113	32	(40)
Net current period change in accumulated other comprehensive (loss) income	15	(318)	(240)
Ending Balance	(418)	(433)	(115)
Accumulated Net Unrealized Investment Gain Loss
Changes in Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(444)	(115)	125
Other comprehensive (loss) income before reclassifications	117	(361)	(200)
Amounts reclassified from accumulated other comprehensive loss	113	32	(40)
Net current period change in accumulated other comprehensive (loss) income	230	(329)	(240)
Ending Balance	(214)	(444)	$ (115)
Cumulative Translation Adjustment
Changes in Accumulated Other Comprehensive Income (Loss)
Beginning Balance	11
Other comprehensive (loss) income before reclassifications	(215)	11
Net current period change in accumulated other comprehensive (loss) income	(215)	11
Ending Balance	$ (204)	$ 11