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Stock-Based Compensation - Plan Information (Details)
$ in Thousands
3 Months Ended
Nov. 21, 2019
USD ($)
shares
Mar. 31, 2020
USD ($)
item
Stock-based compensation    
Number of stock plans | item   4
Expiration period   10 years
Vesting percentage on first anniversary of grant date   25.00%
Remaining vesting period   3 years
Employee Stock Purchase Plan 2015    
Stock-based compensation    
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  
Avedro | Stock options    
Stock-based compensation    
Shares issued in connection with Acquisition 100,000  
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