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Fixed Assets
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Fixed Assets
Fixed Assets
Fixed assets at December 31, 2018 and 2017 consist of the following:
 
 
Cost
 
Accumulated
Depreciation
and
Amortization
 
Net Book
Value
As of December 31, 2018
 
 
 
 
 
Leasehold improvements
$
14,909,341

 
$
(3,464,444
)
 
$
11,444,897

Laboratory equipment
4,031,965

 
(2,425,854
)
 
1,606,111

Office furniture and fixtures
3,198,803

 
(1,767,653
)
 
1,431,150

Computer equipment and other
3,808,824

 
(2,341,968
)
 
1,466,856

 
$
25,948,933

 
$
(9,999,919
)
 
$
15,949,014

As of December 31, 2017
 
 
 
 
 
Leasehold improvements
$
14,553,993

 
$
(2,042,871
)
 
$
12,511,122

Laboratory equipment
3,787,578

 
(1,724,946
)
 
2,062,632

Office furniture and fixtures
3,366,896

 
(1,471,705
)
 
1,895,191

Computer equipment and other
3,718,266

 
(1,867,035
)
 
1,851,231

 
$
25,426,733

 
$
(7,106,557
)
 
$
18,320,176



Depreciation expense for the years ended December 31, 2018, 2017 and 2016 was $3.7 million, $1.9 million and $1.7 million, respectively. The Company determined that the carrying value of these long-lived assets was not impaired during the periods presented.