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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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