Annual report pursuant to Section 13 and 15(d)

Property and equipment, net (Narrative) (Details)

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Property and equipment, net (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Depreciation $ 3,213,000 $ 2,908,000 $ 687,000  
Interest capitalized     $ 500,000 $ 100,000
Asset purchase option   1    
Capital leased assets, gross 400,000 400,000    
Accumulated deprecation (200,000) (100,000)    
Capital leases, net $ 200,000 $ 300,000    
Minimum        
Capital lease term   24 months    
Maximum        
Capital lease term   36 months    
Asset under Construction [Member]        
Area of plant | ft² 136,750