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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 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 305 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84242212&loc=d3e2352-115587 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 + Details
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