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Stock-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share)	$ 0.35		$ 0.35
The total intrinsic value of options exercised	$ 0	$ 5,000	$ 0	$ 5,000
Total cash received from employees as a result of employee stock option exercises			3,600	5,000
Total stock-based compensation	$ 748,000	$ 516,000	$ 2,490,000	$ 1,427,000
Weighted average estimated fair value (in dollars per share)	$ 1.10		$ 1.10			$ 1.23
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted in period	0	0	0	0
Total stock-based compensation	$ 24,000	$ 30,000	$ 73,000	$ 102,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	724,000	435,000	2,400,000	1,200,000
Unrecognized compensation expense	2,700,000	2,100,000	$ 2,700,000	2,100,000
Unrecognized stock-based compensation expense weighted average period			1 year 8 months 12 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	0		$ 0
Common Stock are available for grants					873,000
Stock-based compensation expense	$ 0	$ 51,000	$ 60,000	$ 168,000
Weighted average estimated fair value (in dollars per share)	$ 0	$ 0.47	$ 0	$ 0.47