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Revenue Recognition (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Customer	Sep. 30, 2016 USD ($) Customer Distributor
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Revenue recognized | $	$ 1,306	$ 1,879	$ 2,856	$ 5,163
BARDA Contract [Member]
Concentration Risk [Line Items]
Revenue recognized | $	$ 1,300	$ 1,900	$ 2,900	$ 5,200
Customer Concentration Risk [Member] | Revenue Recognized [Member]
Concentration Risk [Line Items]
Number of customers | Customer			6	2
Concentration risk percentage			61.00%	80.00%
Number of distributors | Distributor				3
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers | Customer			4	1
Concentration risk percentage			78.00%	28.00%
Number of distributors | Distributor				2

X

- Definition

Aggregate revenue earned during the period from recognition of related party deferred revenue, non-product related activities and revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

+ References

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Represents the number of customers included in each grouping.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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