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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basis of presentation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Net (loss) / income	$ 1,058	$ (59,602)	$ (9,548)
Net cash provided by / (used in) operating activities	$ 1,882	$ (29,868)	$ (14,831)

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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