Revenue Recognition (Details) - Customer Concentration Risk - Sales Revenue, Net - Rhopressa	3 Months Ended
Jun. 30, 2018
Distributor One
Disaggregation of Revenue [Line Items]
Concentration risk percentage	34.00%
Distributor Two
Disaggregation of Revenue [Line Items]
Concentration risk percentage	33.00%
Distributor Three
Disaggregation of Revenue [Line Items]
Concentration risk percentage	30.00%

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://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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