Collaborative and Other Arrangements - Merck KGaA (Details) - Merck KGaA	1 Months Ended
Jan. 31, 2017 pre-clinical_program clinical-stage_program oncology_research_and_development_program
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Right to license, number of development programs \| oncology_research_and_development_program	4
Right to license, number of clinical stage programs \| clinical-stage_program	2
Number of pre-clinical stage programs \| pre-clinical_program	2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration