Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Payments - 2016 Stock Incentive Plan (Details)

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Stock-Based Payments - 2016 Stock Incentive Plan (Details) - 2016 Plan - shares
9 Months Ended
Jan. 01, 2018
Jun. 17, 2017
Sep. 30, 2018
Stock-based payments      
Increase in number of shares of common stock reserved for issuance of awards on the first day of each calendar year (in shares)   1,600,000  
Increase in number of shares of common stock reserved for issuance of awards on the first day of each calendar year, as a percentage of outstanding shares   4.00%  
Increase in number of shares of common stock reserved for issuance (in shares) 1,056,935    
Common stock available for future issuance (in shares)     2,969,793
Stock options      
Stock-based payments      
Vesting period     4 years
Term of award     10 years
Stock options | Vesting on one year anniversary of vesting commencement date      
Stock-based payments      
Vesting (as a percent)     25.00%
Stock options | Vesting ratably on a monthly basis      
Stock-based payments      
Vesting period     3 years
Vesting (as a percent)     75.00%