Quarterly report pursuant to Section 13 or 15(d)

Property and equipment, net (Details)

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Property and equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Property and equipment, gross $ 50,794 $ 49,166
Less: accumulated depreciation (4,211) (3,433)
Property and equipment, net 46,583 45,733
Operational Equipment [Member]    
Property and equipment, gross $ 15,478 15,457
Operational Equipment [Member] | Minimum [Member]    
Useful Life (Years) 3 years  
Operational Equipment [Member] | Maximum [Member]    
Useful Life (Years) 10 years  
Lab Equipment [Member]    
Property and equipment, gross $ 685 685
Useful Life (Years) 5 years  
Computer Equipment [Member]    
Property and equipment, gross $ 174 174
Useful Life (Years) 3 years  
Office Furniture And Equipment [Member]    
Property and equipment, gross $ 326 326
Useful Life (Years) 3 years  
Leasehold Improvements [Member]    
Property and equipment, gross $ 1,408 1,408
Leasehold Improvements [Member] | Minimum [Member]    
Useful Life (Years) 5 years  
Leasehold Improvements [Member] | Maximum [Member]    
Useful Life (Years) 7 years  
Land [Member]    
Property and equipment, gross $ 1,047 1,047
Building [Member]    
Property and equipment, gross $ 24,859 24,847
Useful Life (Years) 39 years  
Asset retirement cost [Member]    
Property and equipment, gross $ 670 670
Useful Life (Years) 20 years  
Equipment Under Construction [Member]    
Property and equipment, gross $ 6,147 $ 4,552