Grant, U.S. Government Contract and Joint Venture (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended			40 Months Ended	95 Months Ended
	Sep. 30, 2015	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	Dec. 31, 2018	Dec. 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue		$ 6,127	$ 7,735	$ 10,773	$ 9,653	$ 10,412	$ 8,352	$ 6,732	$ 5,680	$ 34,288	$ 31,176	$ 15,353
CPL Biologicals Private Limited [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		20.00%								20.00%			20.00%	20.00%
Cadila [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Joint Venture Percentage Owned By Others		80.00%								80.00%			80.00%	80.00%
Bill Melinda Gates Foundation [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue										$ 30,800			$ 73,000
Grant agreement	$ 89,100									$ 89,100
Hhs Barda Contract Award [Member] | Maximum [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue														$ 114,000