Employee Benefit Plans (Details)	12 Months Ended				55 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Jan. 01, 2019 USD ($) $ / shares	Jan. 02, 2018 USD ($) $ / shares	Dec. 31, 2013 shares	Jan. 02, 2018 shares
Multiemployer Plans [Line Items]
Required employee age	21 years
Percentage of participants contributions vested	100.00%
Employer matching contribution	25.00%
Participant deferred compensation percentage for match	4.00%
Matching contribution expense	$ 400,000	$ 0	$ 0
Weighted-average fair value per share at date of grant | $ / shares	$ 4.16	$ 5.11	$ 1.74
Employee Stock Purchase Plan
Multiemployer Plans [Line Items]
Maximum employee salary percentage				15.00%
Offering date percentage				85.00%
Purchase date percentage				85.00%
Number of shares authorized | shares				750,000
Shares issued | shares	33,912				174,463
Reserved for future issuance | shares	575,537
Weighted-average fair value per share at date of grant | $ / shares	$ 1.16
Employee stock purchase plan, compensation expense	$ 41,000
Other assets
Multiemployer Plans [Line Items]
Deferred compensation plan asset	2,000,000.0	$ 1,800,000
Accrued expenses and other current liabilities
Multiemployer Plans [Line Items]
Deferred compensation plan liability	$ 600,000	$ 1,000,000.0
Measurement Input, Risk Free Interest Rate | Employee Stock Purchase Plan
Multiemployer Plans [Line Items]
Expected volatility rate	0.0189
Measurement Input, Expected Term | Employee Stock Purchase Plan
Multiemployer Plans [Line Items]
Expected volatility rate	0.25
Measurement Input, Price Volatility | Employee Stock Purchase Plan
Multiemployer Plans [Line Items]
Expected volatility rate	0.465
Measurement Input, Expected Dividend Rate | Employee Stock Purchase Plan
Multiemployer Plans [Line Items]
Expected volatility rate	0