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Stockholders' Equity - Issuance of Common Stock and Warrants (Details)
3 Months Ended
May 29, 2018
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
Apr. 01, 2018
USD ($)
Mar. 29, 2019
USD ($)
offering
Dec. 30, 2018
$ / shares
Class Of Stock [Line Items]          
Shelf registration, number of offerings | offering       1  
Shelf registration, maximum offering | $       $ 75,000,000  
Common stock, par value (in dollars per share) | $ / shares $ 0.001 $ 0.001     $ 0.001
Number of common stock contain in each unit 1        
Number of warrant contain in each unit 0.40        
Exercise price of each unit | $ / shares $ 1.15        
Net proceeds from issuance of common stock | $ $ 13,900,000 $ 4,000 $ 0    
Exercisable period of warrants 60 months        
Strike price of warrants (in dollars per share) | $ / shares $ 1.38        
Fair value assumptions of warrants, expected term 5 years        
Measurement Input, Share Price          
Class Of Stock [Line Items]          
Warrants and Rights Outstanding, Measurement Input 0.57        
Measurement Input, Risk Free Interest Rate          
Class Of Stock [Line Items]          
Warrants and Rights Outstanding, Measurement Input 2.58        
Measurement Input, Price Volatility          
Class Of Stock [Line Items]          
Warrants and Rights Outstanding, Measurement Input 52.75        
Measurement Input, Expected Dividend Rate          
Class Of Stock [Line Items]          
Warrants and Rights Outstanding, Measurement Input 0        
Common stock          
Class Of Stock [Line Items]          
Aggregate shares of common stock issued 13,500,000        
Common stock | Maximum          
Class Of Stock [Line Items]          
Warrants to purchase aggregate shares of common stock 5,400,000