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Revenue Recognition - Summary of Changes in Contract Assets and Liabilities (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Contract liabilities
Deductions	$ (316,000)	$ (1,300,000)
MedImmune
Contract assets
Balance at January 1, 2018		1,693,530
Additions		3,865,641
Deductions		(3,206,848)
Balance at September 30, 2018	2,352,323	2,352,323
Contract liabilities
Balance at January 1, 2018		1,145,500
Additions		732,200
Deductions		(1,582,167)
Balance at September 30, 2018	295,533	295,533
ApolloBio
Contract liabilities
Balance at January 1, 2018		0
Additions		23,000,000
Deductions		(23,000,000)
Balance at September 30, 2018	0	0
Other Counterparty
Contract liabilities
Balance at January 1, 2018		271,894
Additions		93,750
Deductions		(208,291)
Balance at September 30, 2018	$ 157,353	$ 157,353

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