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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 02, 2018
May 03, 2017
Apr. 26, 2017
Mar. 31, 2018
Registered Direct Offering        
Class of Stock [Line Items]        
Number of shares issued or sold (in shares)     1,100,000  
Common stock purchase price (in dollars per share)     $ 21.50  
Proceeds from issuance of common stock, net of offering costs     $ 23.7  
At the Market Offering        
Class of Stock [Line Items]        
Number of shares issued or sold (in shares)       599,284
Common stock maximum amount available for issuance   $ 75.0    
Proceeds of stock sale       $ 10.8
Public Offering | Subsequent Event        
Class of Stock [Line Items]        
Number of shares issued or sold (in shares) 4,500,000      
Common stock purchase price (in dollars per share) $ 21.25      
Over-allotment option | Subsequent Event        
Class of Stock [Line Items]        
Number of shares issued or sold (in shares) 675,000      
Common stock purchase price (in dollars per share) $ 21.25      
Public offering and over-allotment option | Subsequent Event        
Class of Stock [Line Items]        
Proceeds from issuance of common stock, net of offering costs $ 103.0