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Stock-Based Compensation - Plan Information (Details)
$ in Thousands
12 Months Ended
Nov. 21, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
item
shares
Jan. 01, 2019
shares
Dec. 31, 2018
item
shares
Stock-based compensation        
Preferred stock, shares authorized   5,000,000   5,000,000
Preferred stock, shares outstanding   0   0
Number of votes per common share | item   1   1
Number of stock plans | item   4    
Shares reserved for future issuance   13,329,000    
Expiration period   10 years    
Vesting percentage on first anniversary of grant date   25.00%    
Remaining vesting period   3 years    
2015 Stock Plan        
Stock-based compensation        
Shares reserved for future issuance     13,500,000  
Employee Stock Purchase Plan 2015        
Stock-based compensation        
Shares reserved for future issuance     1,800,000  
Maximum employee contributions as a percentage of earnings under the ESPP   15.00%    
Purchase price per share expressed as a percentage of the lower of the stock's fair market value on the offering date or purchase date under the ESPP   85.00%    
First anniversary | RSU        
Stock-based compensation        
Vesting (as a percent)   25.00%    
Second anniversary | RSU        
Stock-based compensation        
Vesting (as a percent)   25.00%    
Third anniversary | RSU        
Stock-based compensation        
Vesting (as a percent)   25.00%    
Fourth anniversary | RSU        
Stock-based compensation        
Vesting (as a percent)   25.00%    
Avedro        
Stock-based compensation        
Fair value of Replacement Awards attributable to pre-combination services | $ $ 30,786      
Fair value of Replacement Awards attributable to post-combination services | $   $ 26,000    
Avedro | RSU        
Stock-based compensation        
Shares issued in connection with Acquisition 5,500      
Avedro | Cash-Settled Stock Option        
Stock-based compensation        
Shares issued in connection with Acquisition 200,000      
Fair value of Replacement Awards attributable to post-combination services | $   3,100    
Avedro | Stock options        
Stock-based compensation        
Shares issued in connection with Acquisition 100,000      
Fair value of Replacement Awards attributable to post-combination services | $   $ 1,500    
Avedro | Time Vesting | RSU        
Stock-based compensation        
Shares issued in connection with Acquisition 100,000      
Avedro | Time Vesting | Stock options        
Stock-based compensation        
Shares issued in connection with Acquisition 700,000