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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability | The following table summarizes changes in the Company’s contract assets and liabilities for the three months ended March 31, 2018:
| Balance at January 1, 2018 |  | Additions |  | Deductions |  | Balance at March 31, 2018
Contract assets |  |  |  |  |  |  |
Accounts receivable from MedImmune | $ | 1,693,530 |  |  | $ | 1,339,961 |  |  | $ | (3,750 | ) |  | $ | 3,029,741 |
Contract liabilities |  |  |  |  |  |  |
Deferred revenue - MedImmune | 1,145,500 |  |  | 582,500 |  |  | (531,583 | ) |  | 1,196,417 |
Deferred revenue - ApolloBio | — |  |  | 23,000,000 |  |  | — |  |  | 23,000,000 |
Deferred revenue - Other | $ | 271,894 |  |  | $ | — |  |  | $ | (120,534 | ) |  | $ | 151,360 |
Summary of Revenue Recognized from Contracts |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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