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Commitments and Contingencies (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 01, 2019
item
Dec. 31, 2018
USD ($)
item
Aug. 31, 2018
item
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Other commitments              
Letter of Credit outstanding   $ 8,800,000   $ 8,800,000   $ 8,800,000  
Restricted cash   8,775,000   $ 8,881,000   $ 8,881,000  
Number of Months from start of lease for adjustments to Letter of Credit | item       37   37  
Frequency of adjustment to Letter of Credit           12 months  
Adjustment rate of Letter of Credit (as a percent)           20.00%  
Amount of Letter of Credit outstanding after adjustments       $ 2,000,000.0   $ 2,000,000.0  
Deferred compensation plan liability   2,000,000.0   3,200,000   3,200,000  
Deferred compensation plan assets   $ 1,900,000   3,100,000   3,100,000  
Purchase commitment obligation       7,200,000   7,200,000  
Agreement with the Regents              
Other commitments              
Minimum required annual payment of the commitment obligation, based on net sales of current and future products       500,000   500,000  
Cost of sales | Agreement with the Regents              
Other commitments              
Commitment obligation payments       1,500,000 $ 1,100,000 4,200,000 $ 3,200,000
Patent Litigation | Pending Litigation              
Other commitments              
Number of patent infringements | item     3        
Number of new new petitions filed | item   2          
Securities Litigation | Pending Litigation              
Other commitments              
Accrual for loss contingency       $ 0   $ 0  
Number of additional lawsuits filed | item 3            
Number of lawsuits that name Avedro and Avedro board of directors as defendants | item 2            
Number of total lawsuits filed | item 4