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Stock Option and Compensation Plans (Details 3) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 03, 2014
Sep. 30, 2014
Stock Option and Compensation Plans          
Share-based compensation expense $ 13,040,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,871,000us-gaap_AllocatedShareBasedCompensationExpense $ 640,000us-gaap_AllocatedShareBasedCompensationExpense    
Stock options          
Stock Option and Compensation Plans          
Share-based compensation expense 11,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		    
Unrecognized share-based compensation costs, net of estimated forfeitures 37,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Expected weighted average period to recognize share-based compensation costs 3 years 1 month 6 days        
Non-employee Options | Consultants          
Stock Option and Compensation Plans          
Share-based compensation expense 1,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= opht_NonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_ConsultantsMember		 700,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= opht_NonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_ConsultantsMember		 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= opht_NonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_ConsultantsMember		    
Unrecognized share-based compensation costs, net of estimated forfeitures 4,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= opht_NonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_ConsultantsMember		        
Expected weighted average period to recognize share-based compensation costs 2 years 10 months 24 days        
Unvested restricted stock          
Stock Option and Compensation Plans          
Units outstanding 37,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Unvested restricted stock | Employees          
Stock Option and Compensation Plans          
Share-based compensation expense 300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= opht_EmployeesMember		        
Unrecognized share-based compensation costs, net of estimated forfeitures $ 900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= opht_EmployeesMember		        
Expected weighted average period to recognize share-based compensation costs 2 years 4 months 24 days        
Options outstanding          
Stock Option and Compensation Plans          
Granted (in shares) 1,744,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember		 1,583,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember		 250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember		    
Granted (in dollars per share) $ 33.92us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember		 $ 14.82us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember		 $ 3.12us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember		    
Options outstanding | New Executive          
Stock Option and Compensation Plans          
Granted (in shares)       150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_NewExecutiveMember		 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_NewExecutiveMember
Granted (in dollars per share)       $ 38.41us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_NewExecutiveMember		 $ 38.93us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= opht_EmployeeAndNonemployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= opht_NewExecutiveMember