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Property 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 [Line Items]          
Property and equipment, gross $ 21,251   $ 21,251   $ 17,296
Less: accumulated depreciation (6,798)   (6,798)   (4,007)
Total property and equipment, net 14,453   14,453   13,289
Depreciation expense 500 $ 400 1,000 $ 700  
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 5,961   $ 5,961   4,647
Leasehold improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life (years)     7 years    
Leasehold improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life (years)     20 years    
Machinery & equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 10,279   $ 10,279   8,193
Machinery & equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life (years)     1 year    
Machinery & equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life (years)     12 years    
Furniture          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 2,595   $ 2,595   2,712
Furniture | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life (years)     1 year    
Furniture | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life (years)     12 years    
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 2,416   $ 2,416   $ 1,744