Business Overview and Summary of Significant Accounting Policies - Narrative (Details)		12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Accounting Policies [Abstract]
Number of business segments | segment		1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts receivable, current		$ 0	$ 0
Provision for doubtful accounts		$ 0	0	$ 0
Period prior to products expiration date for returns accepted		3 months
Period up to products expiration date for returns accepted		6 months
Collaboration revenue for non-refundable up-front payments, development milestones, and payments for development activities, for which used an input method		$ 497,600,000	$ 837,700,000
Three individual customers | Customer concentration risk | Gross Sales Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage		97.00%	99.00%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset					$ 33,200,000
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue	$ 143,400,000
Accounting Standards Update 2014-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment upon adoption of new accounting standards	143,400,000
Accounting Standards Update 2016-01 | Equity Securities | Unrestricted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax	6,600,000
Accounting Standards Update 2016-01 | Retained Earnings | Equity Securities | Unrestricted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment upon adoption of new accounting standards	$ 6,600,000