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ACQUISITION - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2018	Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Equity loss recorded			$ (400)	$ (613)	$ (687)	$ 984
uSTAR
Business Acquisition [Line Items]
Cash invested to acquire equity interest	$ 1,900	$ 1,800
Equity method investment, ownership interest (as a percent)		49.00%
Interest owned after transaction	100.00%		100.00%	100.00%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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