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Revenue Recognition - Narrative (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,502,624	$ 2,000,868	$ 24,448,761	$ 1,529,644	$ 8,787,234	$ 2,644,543	$ 20,412,124	$ 10,376,185	$ 30,481,897	$ 42,220,086	$ 35,368,361
Revenue recognized from deferred revenue beginning balance									1,300,000	14,800,000
ApolloBio
Disaggregation of Revenue [Line Items]
Total revenues									23,000,000
AstraZeneca
Disaggregation of Revenue [Line Items]
Total revenues									6,900,000
Other Counterparty
Disaggregation of Revenue [Line Items]
Total revenues									117,000
GeneOne (affiliated entity)
Disaggregation of Revenue [Line Items]
Revenue from Related Parties									$ 342,000	$ 551,000	$ 1,200,000

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
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