Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Details)

v3.8.0.1
Fair Value Measurements - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers into level 2 from level 1 assets $ 0 $ 0 $ 0  
Transfers into level 1 from level 2 assets 0 0 0  
Impairment loss on intangible assets 1,130,000 $ 0 $ 1,130,000 $ 0
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment loss on intangible assets $ 1,130,000