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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT          
Total $ 23,736   $ 23,736   $ 22,338
Less accumulated depreciation (5,695)   (5,695)   (5,210)
Total property, plant and equipment 18,041   18,041   17,128
Depreciation expense 253 $ 206 494 $ 402  
Cost of product sales          
PROPERTY, PLANT AND EQUIPMENT          
Depreciation expense 91 $ 75 181 $ 150  
Land          
PROPERTY, PLANT AND EQUIPMENT          
Total 9,072   9,072   8,081
Buildings and leasehold improvements          
PROPERTY, PLANT AND EQUIPMENT          
Total 9,379   9,379   9,234
Vehicles          
PROPERTY, PLANT AND EQUIPMENT          
Total 1,552   1,552   1,477
Machinery and equipment          
PROPERTY, PLANT AND EQUIPMENT          
Total 3,518   3,518   3,385
Furniture and fixtures          
PROPERTY, PLANT AND EQUIPMENT          
Total $ 215   $ 215   $ 161