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, 2019
Dec. 31, 2018
Property and equipment, gross $ 44,207 $ 51,590
Less:  accumulated depreciation (6,564) (6,042)
Property and equipment, net 37,643 45,548
Operational Equipment    
Property and equipment, gross $ 12,094 15,926
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 $ 525 698
Computer Equipment    
Useful life (years) 3 years  
Property and equipment, gross $ 221 201
Office Equipment    
Useful life (years) 3 years  
Property and equipment, gross $ 221 336
Land    
Property and equipment, gross $ 1,047 1,047
Building    
Useful life (years) 39 years  
Property and equipment, gross $ 19,508 24,820
Asset Retirement Cost    
Useful life (years) 20 years  
Property and equipment, gross $ 670 670
Equipment Under Construction    
Property and equipment, gross $ 9,921 $ 7,892