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Revenue Recognition - Summary of Changes in Contract Assets and Liabilities (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Contract liabilities
Deductions	$ (652,000)
MedImmune
Contract assets
Balance at January 1, 2018	1,693,530
Additions	1,339,961
Deductions	(3,750)
Balance at March 31, 2018	3,029,741
Contract liabilities
Balance at January 1, 2018	1,145,500
Additions	582,500
Deductions	(531,583)
Balance at March 31, 2018	1,196,417
ApolloBio
Contract liabilities
Balance at January 1, 2018	0
Additions	23,000,000
Deductions	0
Balance at March 31, 2018	23,000,000
Other Counterparty
Contract liabilities
Balance at January 1, 2018	271,894
Additions	0
Deductions	(120,534)
Balance at March 31, 2018	$ 151,360

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