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Business Combination - Summary of Unaudited Pro Forma Information (Detail) - PharmAthene [Member]
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Business Acquisition [Line Items]  
Pro forma revenue and grants and contracts | $ $ 11,844,273
Pro forma net (loss) income attributable to common stockholders | $ $ (52,315,978)
Pro forma weighted average common shares outstanding, basic | shares 518,262
Pro forma net (loss) income per share, basic | $ / shares $ (100.95)
Pro forma weighted average common shares outstanding, diluted | shares 518,262
Pro forma net (loss) income per share, diluted | $ / shares $ (100.95)