Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Class A Redeemable Convertible Preferred Stock (Detail)

v3.10.0.1
Class A Redeemable Convertible Preferred Stock (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 25, 2018
Jun. 24, 2018
Dec. 22, 2016
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 29, 2016
Dec. 30, 2015
Temporary Equity [Line Items]                  
Temporary equity, shares issued       0     6,864,000    
Temporary equity, face value (in dollars per share)       $ 0.001     $ 0.001    
Temporary equity, shares outstanding       0     6,864,000    
Redemption of preferred stock       $ 50,096 $ 0        
Temporary equity, beneficial conversion feature, recognition period (in years)       3 years          
Series A Redeemable Convertible Preferred Stock                  
Temporary Equity [Line Items]                  
Temporary equity, shares issued                 14,666,667
Temporary equity, face value (in dollars per share)     $ 7.50           $ 7.50
Temporary equity, liquidation value     $ 49,500           $ 110,000
Temporary equity liquidation amount at redemption               $ 100,000  
Temporary equity shares redemption     8,066,667            
Temporary equity redemption amount     $ 55,000            
Temporary equity, redemption per share (in dollars per share) $ 7.30   $ 6.82            
Redemption discounts percentage 4.55%   9.09%            
Temporary equity, shares outstanding           6,864,000      
Redemption of preferred stock $ 50,100                
Additional amount per share added for accrued and unpaid dividends (in dollars per share) $ 0.14                
Temporary equity, carrying amount   $ 37,800              
Temporary equity, recognized amount of beneficial conversion feature   $ (21,300)              
Temporary equity, fair value     $ 32,900           $ 73,200
Temporary equity issued, price per share (in dollars per share)     $ 4.99           $ 4.99
Temporary equity issue discount     $ 16,600           $ 36,800
Temporary equity, value of beneficial conversion feature     $ 20,100           $ 44,700
Series A Redeemable Convertible Preferred Stock | Payment In Kind Period Two                  
Temporary Equity [Line Items]                  
Temporary equity, shares issued             264,000