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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 04, 2011 | Sep. 30, 2005 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and contingencies |  |  |  |  |
Long-term lease obligations |  |  | $ 3,468 | $ 2,588 |
Lease agreement entered into September 2005 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Lease term |  | 15 years |  |  |
Gain related to previous lease liability settlement, included in rent expense |  |  |  |  | $ (116)
Lease agreement entered into April 2011 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Lease term | 7 years |  |  |  |
Obligation of sublessor towards the cost of alterations of office space | $ 472 |  |  |  |
Long-term lease obligations |  |  | 3,468 | 2,588 |
Rent expense |  |  | 1,808 | $ 1,808 | $ 1,808
Future minimum rental payments |  |  |  |  |
2019 |  |  | 2,230 |  |
2020 |  |  | 2,230 |  |
2021 |  |  | 2,230 |  |
2022 |  |  | 2,230 |  |
2023 |  |  | 2,378 |  |
Remaining term of the lease |  |  | 4,292 |  |
Lease agreement entered into April 2011 | Period from October 1, 2018 to April 30, 2023 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Monthly rental payment |  |  | 186 |  |
Lease agreement entered into April 2011 | Period from May 1, 2023 to September 30, 2025 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Monthly rental payment |  |  | 204 |  |
Lease agreement entered into April 2011 | Period During July 9, 2014 To September 30, 2025 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Monthly straight-line rental expense |  |  | $ 150 |  |
Sub Sublease Agreement | Period November 1, 2011 until May 31, 2015 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Monthly rental payment | 82 |  |  |  |
Sub Sublease Agreement | Period after May 31, 2015 until April 30, 2018 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Monthly rental payment | $ 90 |  |  |  |

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- Definition Represents the monthly payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease. + References No definition available. + Details
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- Definition Represents the obligation of sublessor towards the cost of alterations to the assets under the lease agreement. + References No definition available. + Details
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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 + Details
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