For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Revenue Recognition (Details) $ in Millions	3 Months Ended		6 Months Ended
Revenue Recognition (Details) $ in Millions	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) distributor	Jun. 30, 2019 USD ($) distributor
Disaggregation of Revenue [Line Items]
Provisions for revenue reserves to reduce product revenues to product revenues, net \| $	$ 46.1	$ 26.6	$ 89.8	$ 42.8
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa and Rocklatan
Disaggregation of Revenue [Line Items]
Number of distributors \| distributor			3	3
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa and Rocklatan \| Distributor One
Disaggregation of Revenue [Line Items]
Concentration risk percentage			37.00%	36.00%
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa and Rocklatan \| Distributor Two
Disaggregation of Revenue [Line Items]
Concentration risk percentage			33.00%	33.00%
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa and Rocklatan \| Distributor Three
Disaggregation of Revenue [Line Items]
Concentration risk percentage			29.00%	28.00%