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Fixed Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of fixed assets
Fixed assets at December 31, 2017 and 2016 consist of the following:
 
 
Cost
 
Accumulated
Depreciation
and
Amortization
 
Net Book
Value
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

As of December 31, 2016
 
 
 
 
 
Leasehold improvements
$
5,248,311

 
$
(1,199,415
)
 
$
4,048,896

Laboratory equipment
3,534,302

 
(1,072,188
)
 
2,462,114

Office furniture and fixtures
1,814,493

 
(1,108,187
)
 
706,306

Computer equipment and other
3,684,521

 
(1,876,391
)
 
1,808,130

 
$
14,281,627

 
$
(5,256,181
)
 
$
9,025,446