Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning Balance, value at Dec. 30, 2017	$ 30,522		$ 126	$ 59,385		$ (28,989)
Beginning Balance, shares at Dec. 30, 2017			11,596,274
Proceeds from issuance of common stock, net of issuance costs	10,480		$ 19	10,461
Proceeds from issuance of common stock, net of issuance costs, Shares			1,916,667
Issuance of common stock under stock option plan	97			97
Issuance of common stock under stock option plan, shares			23,750
Employee stock-based compensation expense	1,516			1,516
Release of restricted stock, value net of taxes paid	(176)			(176)
Release of restricted stock, shares net of taxes paid			58,108
Other comprehensive income	127				$ 127
Net income (loss)	(9,957)					(9,957)
Ending Balance, value at Sep. 29, 2018	32,609		$ 145	71,283	127	(38,946)
Ending Balance, shares at Sep. 29, 2018			13,594,799
Beginning Balance, value at Jun. 30, 2018	24,433		$ 126	60,138	41	(35,872)
Beginning Balance, shares at Jun. 30, 2018			11,663,838
Proceeds from issuance of common stock, net of issuance costs	10,480		$ 19	10,461
Proceeds from issuance of common stock, net of issuance costs, Shares			1,916,667
Issuance of common stock under stock option plan	35			35
Issuance of common stock under stock option plan, shares			7,500
Employee stock-based compensation expense	673			673
Release of restricted stock, value net of taxes paid	(24)			(24)
Release of restricted stock, shares net of taxes paid			6,794
Other comprehensive income	86				86
Net income (loss)	(3,074)					(3,074)
Ending Balance, value at Sep. 29, 2018	32,609		$ 145	71,283	127	(38,946)
Ending Balance, shares at Sep. 29, 2018			13,594,799
Beginning Balance, value at Dec. 29, 2018	$ 29,961	[1]	$ 145	71,548	70	(41,802)
Beginning Balance, shares at Dec. 29, 2018	13,602,052		13,602,052
Issuance of common stock under stock option plan, shares	210		210
Employee stock-based compensation expense	$ 1,398			1,398
Release of restricted stock, value net of taxes paid	(151)		$ 2	(153)
Release of restricted stock, shares net of taxes paid			176,610
Other comprehensive income	32				32
Net income (loss)	(7,252)					(7,252)
Ending Balance, value at Sep. 28, 2019	$ 23,988		$ 147	72,793	102	(49,054)
Ending Balance, shares at Sep. 28, 2019	13,778,872		13,778,872
Beginning Balance, value at Jun. 29, 2019	$ 25,629		$ 147	72,685	66	(47,269)
Beginning Balance, shares at Jun. 29, 2019			13,746,959
Employee stock-based compensation expense	158			158
Release of restricted stock, value net of taxes paid	(50)			(50)
Release of restricted stock, shares net of taxes paid			31,913
Other comprehensive income	36				36
Net income (loss)	(1,785)					(1,785)
Ending Balance, value at Sep. 28, 2019	$ 23,988		$ 147	$ 72,793	$ 102	$ (49,054)
Ending Balance, shares at Sep. 28, 2019	13,778,872		13,778,872

[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 29, 2018.