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LEASE LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2019
LEASE LIABILITIES |
Schedule of lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Total discounted lease liabilities
​ | ​ | June 30, 2019 | ​ | December 31, 2018
Finance leases | ​ | $ | 7,039 | ​ | ​ | 6,429
Operating lease | ​ | ​ | 969 | ​ | $ | —
Lease liabilities | ​ | $ | 8,008 | ​ | $ | 6,429
Current portion | ​ | ​ | (2,007) | ​ | ​ | (1,511)
Long-term portion | ​ | $ | 6,001 | ​ | $ | 4,918
Schedule of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
​ | ​ | Operating lease | ​ | Finance leases | ​ | Operating lease | ​ | Finance leases
Amortization of ROU assets | ​ | $ | 27 | ​ | $ | 318 | ​ | $ | 53 | ​ | $ | 485
Interest expense | ​ | ​ | 21 | ​ | ​ | 153 | ​ | ​ | 43 | ​ | ​ | 288
Total | ​ | $ | 48 | ​ | $ | 471 | ​ | $ | 96 | ​ | $ | 773
Schedule of undiscounted lease payment obligations, operating lease | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Payments due by period
​ |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total
Operating lease obligation | ​ | $ | 111 | ​ | $ | 225 | ​ | $ | 230 | ​ | $ | 232 | ​ | $ | 237 | ​ | $ | 158 | ​ | $ | 1,193
Finance lease obligations | ​ |  | 1,194 | ​ |  | 2,317 | ​ |  | 2,362 | ​ |  | 2,057 | ​ |  | 105 | ​ |  | — | ​ | ​ | 8,035
Total future minimum lease payments | ​ | $ | 1,305 | ​ | $ | 2,542 | ​ | $ | 2,592 | ​ | $ | 2,289 | ​ | $ | 342 | ​ | $ | 158 | ​ | $ | 9,228
Less: Imputed interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (1,220)
Total | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 8,008
​
Schedule of undiscounted lease payment obligations, finance lease | Future minimum lease payments (undiscounted) as at June 30, 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Payments due by period
​ |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total
Operating lease obligation | ​ | $ | 111 | ​ | $ | 225 | ​ | $ | 230 | ​ | $ | 232 | ​ | $ | 237 | ​ | $ | 158 | ​ | $ | 1,193
Finance lease obligations | ​ |  | 1,194 | ​ |  | 2,317 | ​ |  | 2,362 | ​ |  | 2,057 | ​ |  | 105 | ​ |  | — | ​ | ​ | 8,035
Total future minimum lease payments | ​ | $ | 1,305 | ​ | $ | 2,542 | ​ | $ | 2,592 | ​ | $ | 2,289 | ​ | $ | 342 | ​ | $ | 158 | ​ | $ | 9,228
Less: Imputed interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (1,220)
Total | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 8,008
​

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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