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5. PROPERTY AND EQUIPMENT (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Property, plant and equipment, gross $ 41,393,727 $ 37,466,273
Less: accumulated depreciation and amortization (6,332,932) (5,724,956)
Property, plant and equipment, net 35,060,795 31,741,317
Manufacturing and laboratory equipment    
Property, plant and equipment, gross 9,524,749 8,831,817
Office equipment and computer software    
Property, plant and equipment, gross 2,220,856 1,690,248
Furniture and fixtures    
Property, plant and equipment, gross 1,133,132 582,088
Construction in process    
Property, plant and equipment, gross 6,022,188 4,285,915
Leasehold improvements    
Property, plant and equipment, gross 1,673,084 1,673,084
Land    
Property, plant and equipment, gross 4,339,441 4,339,441
Buildings    
Property, plant and equipment, gross $ 16,480,277 $ 16,063,680