Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance, value at Dec. 31, 2016	$ 39,160	$ 124	$ 55,158		$ (16,122)
Beginning Balance, shares at Dec. 31, 2016		11,304,736
Proceeds from issuance of common stock, net of issuance costs, value	2,263	$ 2	2,261
Proceeds from issuance of common stock, net of issuance costs, shares		172,500
Issuance of common stock under stock option plan	$ 377		377
Issuance of common stock under stock option plan, shares	64,380	64,380
Employee stock-based compensation expense	$ 1,922		1,922
Release of restricted stock, value	(333)		(333)
Release of restricted stock, shares		54,658
Net loss	(12,867)				(12,867)
Ending Balance, value at Dec. 30, 2017	$ 30,522	$ 126	59,385		(28,989)
Ending Balance, shares at Dec. 30, 2017	11,596,274	11,596,274
Proceeds from issuance of common stock, net of issuance costs, value	$ 10,475	$ 19	10,456
Proceeds from issuance of common stock, net of issuance costs, shares		1,916,667
Issuance of common stock under stock option plan	$ 98		98
Issuance of common stock under stock option plan, shares	24,050	24,050
Employee stock-based compensation expense	$ 1,803		1,803
Release of restricted stock, value	(194)		(194)
Release of restricted stock, shares		65,061
Other comprehensive income	70			$ 70
Net loss	(12,813)				(12,813)
Ending Balance, value at Dec. 29, 2018	$ 29,961	$ 145	$ 71,548	$ 70	$ (41,802)
Ending Balance, shares at Dec. 29, 2018	13,602,052	13,602,052