Subsequent Events (Details) - Royalty-backed loan agreement - HCRP - USD ($)	1 Months Ended	3 Months Ended
May 31, 2017	Dec. 31, 2017
Subsequent Event [Line Items]
Proceeds from issuance of debt	$ 35,000,000
Scenario, Forecast
Subsequent Event [Line Items]
Proceeds from issuance of debt		$ 65,000,000.0

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.

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