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LEASES - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 14, 2019 | Apr. 04, 2011 | Jun. 30, 2019 | Jun. 30, 2019
Leases |  |  |  |
Impairment of right-of-use asset |  |  | $ 223 | $ 223
Sublease income |  |  | 0 | 0
Total lease cost |  |  | 454 | 906
Period from July 26, 2019 to September 29, 2025 |  |  |  |
Leases |  |  |  |
Free base rental period of the sublease | 4 months 15 days |  |  |
Period from December 10, 2019 to September 29, 2025 |  |  |  |
Leases |  |  |  |
Monthly base sublease income | $ 102 |  |  |
Lease agreement entered into April 2011 |  |  |  |
Leases |  |  |  |
Lease term |  | 7 years |  |
Obligation of sublessor towards the cost of alterations of office space |  | $ 472 |  |
Lease agreement entered into April 2011 | Period from October 1, 2018 to April 30, 2023 |  |  |  |
Leases |  |  |  |
Monthly rental payment |  |  | 186 | 186
Lease agreement entered into April 2011 | Period from May 1, 2023 to September 30, 2025 |  |  |  |
Leases |  |  |  |
Monthly rental payment |  |  | $ 204 | $ 204
Sub Sublease Agreement | Period November 1, 2011 until May 31, 2015 |  |  |  |
Leases |  |  |  |
Monthly rental payment |  | 82 |  |
Sub Sublease Agreement | Period after May 31, 2015 until April 30, 2018 |  |  |  |
Leases |  |  |  |
Monthly rental payment |  | $ 90 |  |

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