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Fixed Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Cost $ 25,426,733 $ 14,281,627  
Accumulated Depreciation and Amortization (7,106,557) (5,256,181)  
Net Book Value 18,320,176 9,025,446  
Depreciation 1,850,376 1,708,498 $ 1,048,431
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Cost 14,553,993 5,248,311  
Accumulated Depreciation and Amortization (2,042,871) (1,199,415)  
Net Book Value 12,511,122 4,048,896  
Laboratory equipment      
Property, Plant and Equipment [Line Items]      
Cost 3,787,578 3,534,302  
Accumulated Depreciation and Amortization (1,724,946) (1,072,188)  
Net Book Value 2,062,632 2,462,114  
Office furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Cost 3,366,896 1,814,493  
Accumulated Depreciation and Amortization (1,471,705) (1,108,187)  
Net Book Value 1,895,191 706,306  
Computer equipment and other      
Property, Plant and Equipment [Line Items]      
Cost 3,718,266 3,684,521  
Accumulated Depreciation and Amortization (1,867,035) (1,876,391)  
Net Book Value $ 1,851,231 $ 1,808,130