Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance, value at Dec. 28, 2013	$ 25,854	$ 104	$ 40,671	$ (14,921)
Beginning Balance, shares at Dec. 28, 2013		9,899,483
Issuance of common stock under stock option plan	$ 1,501	$ 4	1,497
Issuance of common stock under stock option plan, shares	399,390	399,390
Employee stock-based compensation expense	$ 972		972
Excess tax benefits from stock-based awards	36		36
Release of restricted stock, shares		50,262
Stock repurchase	$ (4,665)		(4,665)
Stock repurchase, shares	(562,440)	(562,440)
Net (loss) income	$ 10,038			10,038
Ending Balance, value at Jan. 03, 2015	33,736	$ 108	38,511	(4,883)
Ending Balance, shares at Jan. 03, 2015		9,786,695
Issuance of common stock under stock option plan	$ 1,027	$ 3	1,024
Issuance of common stock under stock option plan, shares	277,733	277,733
Employee stock-based compensation expense	$ 895		895
Release of restricted stock, value	(606)		(606)
Release of restricted stock, shares		144,756
Repurchase of employee share awards	(275)		(275)
Stock repurchase	$ (1,563)		(1,563)
Stock repurchase, shares	(199,776)	(199,776)
Net (loss) income	$ 474			474
Ending Balance, value at Jan. 02, 2016	$ 33,688	$ 111	37,986	(4,409)
Ending Balance, shares at Jan. 02, 2016	10,009,408	10,009,408
Proceeds from issuance of common stock, net of issuance costs, value	$ 14,813	$ 12	14,801
Proceeds from issuance of common stock, net of issuance costs, shares		1,150,000
Issuance of common stock under stock option plan	$ 709	$ 1	708
Issuance of common stock under stock option plan, shares	126,077	126,077
Employee stock-based compensation expense	$ 1,821		1,821
Release of restricted stock, value	(99)		(99)
Release of restricted stock, shares		25,795
Stock repurchase	$ (59)		(59)
Stock repurchase, shares	(6,544)	(6,544)
Net (loss) income	$ (11,713)			(11,713)
Ending Balance, value at Dec. 31, 2016	$ 39,160	$ 124	$ 55,158	$ (16,122)
Ending Balance, shares at Dec. 31, 2016	11,304,736	11,304,736