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Revenue Recognition - Summary of Changes in Contract Assets and Liabilities (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Contract liabilities
Deductions	$ (354,000)	$ (1,000,000)
MedImmune
Contract assets
Balance at January 1, 2018		1,693,530
Additions		2,541,901
Deductions		(3,142,901)
Balance at June 30, 2018	1,092,530	1,092,530
Contract liabilities
Balance at January 1, 2018		1,145,500
Additions		582,500
Deductions		(882,000)
Balance at June 30, 2018	846,000	846,000
ApolloBio
Contract liabilities
Balance at January 1, 2018		0
Additions		23,000,000
Deductions		(23,000,000)
Balance at June 30, 2018	0	0
Other Counterparty
Contract liabilities
Balance at January 1, 2018		271,894
Additions		0
Deductions		(125,251)
Balance at June 30, 2018	$ 146,643	$ 146,643

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