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Revenue Recognition - Narrative (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |
Revenue recognized from deferred revenue beginning balance | $ 652,000
MedImmune |
Disaggregation of Revenue [Line Items] |
Total revenue recognized | 1,300,000
Revenue recognized from deferred revenue beginning balance | 531,583
GeneOne |
Disaggregation of Revenue [Line Items] |
Total revenue recognized | 118,000
Other Counterparty |
Disaggregation of Revenue [Line Items] |
Total revenue recognized | 123,000
Revenue recognized from deferred revenue beginning balance | $ 120,534

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