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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Standards (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
ASSETS |  |  |
Right-of-use assets - operating leases | $ 1,640 | $ 2,268 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Current portion of operating lease obligation | 330 | 1,358 |
Noncurrent portion of operating lease obligation | 1,307 | 905 |
Deferred income tax liabilities | 3,416 | 1,701 | 1,700
Accumulated Surplus | $ 112,261 | 81,358 | $ 81,354
Lease, Practical Expedients, Package [true false] | true |  |
ASU 2016-02 | Cumulative Effect Adjustment |  |  |
ASSETS |  |  |
Right-of-use assets - operating leases |  | 2,268 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Current portion of operating lease obligation |  | 1,358 |
Noncurrent portion of operating lease obligation |  | 905 |
Deferred income tax liabilities |  | 1 |
Accumulated Surplus |  | $ 4 |

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