Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Summary of Significant Accounting Policies - Subsequent Event (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Non Cash Royalty Revenue Related To Sale of Future Royalties		$ 12,894	$ 32,154	$ 28,142	$ 25,299
Kadcyla \| Subsequent event \| OMERS
Subsequent Event [Line Items]
Non Cash Royalty Revenue Related To Sale of Future Royalties	$ 65,200