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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jan. 02, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense—acquisitions   $ 0.6   $ 0.7   $ 1.3 $ 2.2
Share-based compensation expense     $ 5.2 $ 1.0 $ 6.2   $ 1.0
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation   22.6       $ 22.6  
Total unrecognized compensation, period of recognition           2 years 6 months 10 days  
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation, period of recognition           3 years 25 days  
Total unrecognized compensation   $ 107.4       $ 107.4  
2015 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum number of additional shares issued annually (in shares) 2,395,434            
Number of shares authorized (in shares)   31,831,808       31,831,808  
Number of shares available for grant (in shares)   20,584,299       20,584,299