CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Jan. 03, 2020	$ 159,884	$ 448	$ 304,288	$ (3,048)	$ (141,804)
Balance (in shares) at Jan. 03, 2020		44,822
Net income (loss)	(134)				(134)
Other comprehensive income	22			22
Common stock issued upon exercise of options	2,004	$ 2	2,002
Common stock issued upon exercise of options (in shares)		196
Stock-based compensation	3,190		3,190
Vested restricted stock	1	$ 1
Vested restricted stock (in shares)		87
Balance at Apr. 03, 2020	164,967	$ 451	309,480	(3,026)	(141,938)
Balance (in shares) at Apr. 03, 2020		45,105
Balance at Jan. 01, 2021	197,222	$ 464	338,194	(5,545)	(135,891)
Balance (in shares) at Jan. 01, 2021		46,448
Net income (loss)	4,992				4,992
Other comprehensive income	2,088			2,088
Common stock issued upon exercise of options	$ 6,234	$ 4	6,230
Common stock issued upon exercise of options (in shares)	376	376
Stock-based compensation	$ 3,639		3,639
Vested restricted stock	1	$ 1
Vested restricted stock (in shares)		33
Balance at Apr. 02, 2021	$ 214,176	$ 469	$ 348,063	$ (3,457)	$ (130,899)
Balance (in shares) at Apr. 02, 2021		46,857