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Description of Business (Details) $ in Thousands		3 Months Ended						9 Months Ended		12 Months Ended
	Jun. 24, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 28, 2019 USD ($) segment	Sep. 29, 2018 USD ($)	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)
Number of reportable segment | segment								1
Net loss		$ (3,108)	$ (3,519)	$ (4,050)	$ (4,644)	$ (3,417)	$ (4,673)	$ (10,677)	$ (12,734)	$ 17,100	$ 13,400
Common Stock Purchase Agreement | Maximum
Issuance of commitment shares	$ 10,000

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