Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Concentrations Narrative (Details)

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Commitments and Contingencies - Concentrations Narrative (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
ft²
a
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
APC Facility        
Concentrations        
Size of building space | ft² 107      
Area of land where building resides | a 8.6      
Payments to acquire Land $ 731      
Payments to acquire Building $ 4,300      
Design build agreement | APC Facility | Projects in process        
Concentrations        
Expenses related to improvements   $ 15,724    
Expenses related to improvements in current year   9,645 $ 5,819 $ 260
Design build agreement | Maximum | APC Facility        
Concentrations        
Receivable economic development grants from state and local authorities   2,685    
Cash grants   $ 1,250    
Vendor        
Concentrations        
Number of products from which revenue is derived   5