Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended
	Jan. 15, 2015	Jul. 31, 2009	Mar. 31, 2015	Apr. 30, 2015	Jan. 07, 2015
Commitments and Contingencies [Line Items]
Amount of contract expectation damages	$ 113.1				$ 113.0
Amount of award	194.6
Expert witness fees	81.5
Warrant expiration date		Jan. 28, 2015
Initial Maximum Maintenance Failure Obligation [Member]
Commitments and Contingencies [Line Items]
Percentage of aggregate principal amount of convertible Notes			1.00%
Aggregate principal amount of obligation			0.2
Every 30 days until failure is cured [Member]
Commitments and Contingencies [Line Items]
Percentage of aggregate principal amount of convertible Notes			1.00%
Aggregate principal amount of obligation			0.2
BARDA [Member] | Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Audited BARDA revenue				$ 5.8