Subsequent events (Details) - Subsequent event - Turning Point $ in Thousands	1 Months Ended
Jul. 31, 2020 USD ($)
Subsequent events
Payment of upfront fees	$ 25,000
Maximum
Subsequent events
Additional milestone payments	$ 151,000

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