Subsequent Events - Narrative (Details) - Subsequent Event professional in Thousands	Apr. 30, 2018 representative professional
Subsequent Event [Line Items]
Number of sales representatives \| representative	100
Number of prescribing eye-care professionals \| professional	14

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