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Business Combination - Schedule of Purchase Price Allocation (Detail) - USD ($)
Sep. 30, 2017
May 04, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 9,334,904   $ 18,758,421
PharmAthene [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 13,684,535  
Accounts receivable   1,124,462  
Prepaid expenses and other current assets   597,172  
Tax refund receivable   2,047,234  
Property and equipment   75,779  
IPR&D   22,389,000  
Goodwill   15,573,822  
Total assets acquired   55,492,004  
Accounts payable and accrued expenses   (2,193,785)  
Deferred tax liability   (8,555,482)  
Total liabilities assumed   (10,749,267)  
Net assets acquired   $ 44,742,737