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

Subsequent Event - Amphastar Amendment - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 15, 2019	Sep. 15, 2019	Jul. 18, 2019
Scenario Forecast
Subsequent Event [Line Items]
Purchase commitments, amendment fees	$ 1,250	$ 1,500
Subsequent Event
Subsequent Event [Line Items]
Purchase obligation extended term			2 years