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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Impact of Adopting ASC 606 on Audited Consolidated Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Revenue | $ 115,944 | $ 98,292 | $ 86,512
Cost of Net Sales | 83,676 | 65,146 | 58,156
Gross Profit | 32,268 | 33,146 | 28,356
Net Income | 4,820 | $ 6,981 | $ 132
Balance Without Adoption of ASC 606 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Revenue | 60,438 |  |
Cost of Net Sales | 32,409 |  |
Gross Profit | 28,029 |  |
Net Income | 581 |  |
ASU 2014-09 | Effect of Change Higher/(Lower) |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Revenue | 55,506 |  |
Cost of Net Sales | 51,267 |  |
Gross Profit | 4,239 |  |
Net Income | $ 4,239 |  |

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