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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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