Revenue Recognition (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Total revenues, net	$ 19.6
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa \| Distributor One
Disaggregation of Revenue [Line Items]
Concentration risk percentage	33.30%
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa \| Distributor Two
Disaggregation of Revenue [Line Items]
Concentration risk percentage	29.70%
Customer Concentration Risk \| Sales Revenue, Net \| Rhopressa \| Distributor Three
Disaggregation of Revenue [Line Items]
Concentration risk percentage	33.90%

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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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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