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Summary of significant accounting policies (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Property, plant and equipment
The Company depreciates all asset classes over their estimated useful lives, as follows:
Building
20 - 25 years
Equipment
7 - 10 years
Office furniture and equipment
3 years
Leasehold improvements
shorter of asset life or lease term
Vehicles
3 years
Major classifications of property, plant and equipment are summarized as follows for December 31, 2018 and 2017:
 
 
2018
 
2017
Land
 
$
704,567

 
$
676,083

Building and improvements
 
9,244,737

 
9,187,160

Construction in process
 
6,091,265

 
5,119,961

Equipment
 
9,713,030

 
8,211,510

Office furniture and equipment
 
192,606

 
136,091

Vehicles
 
26,832

 
29,135

Total property and equipment
 
$
25,973,037

 
$
23,359,940

Less accumulated depreciation and amortization
 
(2,256,269
)
 
(1,556,964
)
Property, plant and equipment, net
 
$
23,716,768

 
$
21,802,976