Annual report pursuant to Section 13 and 15(d)

Property and equipment, net (Details)

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Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property and equipment, gross $ 51,590 $ 49,166
Asset retirement obligation 745 701
Less: accumulated depreciation (6,042) (3,433)
Property and equipment, net 45,548 45,733
Operational Equipment    
Property and equipment, gross $ 15,926 15,457
Operational Equipment | Minimum    
Useful life (years) 3 years  
Operational Equipment | Maximum    
Useful life (years) 10 years  
Lab Equipment    
Useful life (years) 5 years  
Property and equipment, gross $ 698 685
Computer Equipment    
Useful life (years) 3 years  
Property and equipment, gross $ 201 174
Office Equipment    
Useful life (years) 3 years  
Property and equipment, gross $ 336 326
Leasehold Improvements    
Property and equipment, gross $ 0 1,408
Leasehold Improvements | Minimum    
Useful life (years) 5 years  
Leasehold Improvements | Maximum    
Useful life (years) 7 years  
Land    
Property and equipment, gross $ 1,047 1,047
Building    
Useful life (years) 39 years  
Property and equipment, gross $ 24,820 24,847
Asset Retirement Cost    
Useful life (years) 20 years  
Property and equipment, gross $ 670  
Asset retirement obligation   670
Equipment Under Construction    
Property and equipment, gross $ 7,892 $ 4,552