Subsequent Events - Additional Information (Details) - UroGen Pharma Inc. - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Apr. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Lease commencement date		May 31, 2016
Subsequent Event
Subsequent Event [Line Items]
Lease commencement date	Sep. 30, 2018
Lease termination date	Dec. 31, 2023
Contractual obligation	$ 1,400

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