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Revenue Recognition (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Distributor Customer	Jun. 30, 2014 USD ($) Distributor
Concentration Risk [Table]
Revenues	$ 1,614,000	$ 935,000	$ 2,516,000	$ 1,965,000
Concentration risk percentage (in hundredths)	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk [Member] | Revenue Recognized [Member]
Concentration Risk [Table]
Number of distributors | Distributor			2	5
Number of customers | Customer			3
Concentration risk percentage (in hundredths)			68.00%	71.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk [Table]
Number of distributors | Distributor				3
Number of customers | Customer			2
Concentration risk percentage (in hundredths)			73.00%	78.00%
BARDA Contract [Member]
Research and Development Arrangements [Line Items]
Revenue recognized	$ 1,800,000	$ 400,000	$ 3,300,000	$ 800,000
Americas [Member]
Concentration Risk [Table]
Revenues	$ 272,000	$ 227,000	$ 477,000	$ 264,000
Concentration risk percentage (in hundredths)	17.00%	24.00%	19.00%	14.00%
Japan [Member]
Concentration Risk [Table]
Revenues	$ 352,000	$ 618,000	$ 957,000	$ 1,263,000
Concentration risk percentage (in hundredths)	22.00%	66.00%	38.00%	64.00%
Europe [Member]
Concentration Risk [Table]
Revenues	$ 328,000	$ 90,000	$ 416,000	$ 438,000
Concentration risk percentage (in hundredths)	20.00%	10.00%	17.00%	22.00%
Asia Pacific [Member]
Concentration Risk [Table]
Revenues	$ 662,000	$ 0	$ 666,000	$ 0
Concentration risk percentage (in hundredths)	41.00%	0.00%	26.00%	0.00%

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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.

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