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FINANCIAL INSTRUMENTS - Schedule of Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Marketable securities		$ 415
Total current assets recorded at fair value		415
Restricted cash	$ 3,750	3,732
Total non-current assets recorded at fair value	3,750	3,732
Fair Value, Inputs, Level 1 [Member]
Marketable securities		415
Total current assets recorded at fair value		415
Restricted cash	3,750	3,732
Total non-current assets recorded at fair value	3,750	3,732
Fair Value, Inputs, Level 2 [Member]
Marketable securities
Total current assets recorded at fair value
Restricted cash
Total non-current assets recorded at fair value
Fair Value, Inputs, Level 3 [Member]
Marketable securities
Total current assets recorded at fair value
Restricted cash
Total non-current assets recorded at fair value

X

- Definition

Amount of investment in marketable security, classified as current.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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