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Stock Incentive Plans - Restricted Units (Details) - shares
Jul. 01, 2017
Jan. 01, 2016
Stock Incentive Plans    
Issuance of common stock in exchange for vested restricted stock units (in shares)   17,546
Restricted stock units    
Stock Incentive Plans    
RSUs, vested and released, gross (in shares)   27,768
RSU shares used to pay withholding taxes (in shares)   10,172
2013 Plan | Restricted stock units    
Stock Incentive Plans    
Vesting (as a percent)   50.00%
2013 Plan | Restricted stock units | Forecast    
Stock Incentive Plans    
Vesting (as a percent) 50.00%