SEGMENT INFORMATION - Major customers (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Information about major customers
Revenue	$ 56,733	$ 65,925	$ 47,155
Over percent of total sales (or above)	10.00%	10.00%	10.00%
Customer A
Information about major customers
Revenue	$ 13,056	$ 10,504	$ 7,420
Customer B
Information about major customers
Revenue	11,684	10,861	6,951
Customer C
Information about major customers
Revenue	$ 9,912	8,164
Customer D
Information about major customers
Revenue		$ 7,103	$ 7,834

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details