Annual report pursuant to Section 13 and 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
12 Months Ended
Jan. 01, 2017
Dec. 31, 2017
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) 935,430  
Common stock available for future issuance (in shares)   2,880,493
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%