Acquisitions, Investments and Licenses - Equity and Cost Method Investments Narrative (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Total assets of equity method investees	$ 415.4
Total (liabilities) of equity method investees	(203.2)
Net (losses) of equity method investees	(106.1)
Market value	$ 67.4
Pharmsynthez
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	9.00%
Cocrystal
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	9.00%
Sevion
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	31.00%
Non-Invasive Monitoring Systems, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	1.00%
Neovasc
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	4.00%
VBI Vaccines Inc
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	15.00%
InCellDx, Inc
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	28.00%
BioCardia, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	5.00%
Eloxx Pharmaceuticals
Schedule of Equity Method Investments [Line Items]
Ownership percentage, cost method	3.00%
Xenetic Biosciences, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage, equity method	4.00%

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