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	2,586				2,586
Other comprehensive income (loss)	123			123
Common stock issued upon exercise of options	13,986	$ 12	13,974
Common stock issued upon exercise of options (in shares)		1,146
Stock-based compensation	$ 9,812		9,812
Unvested restricted stock (in shares)	11	11
Vested restricted stock	$ 1	$ 1
Vested restricted stock (in shares)		93
Balance at Oct. 02, 2020	186,392	$ 461	328,074	(2,925)	(139,218)
Balance (in shares) at Oct. 02, 2020		46,072
Balance at Jul. 03, 2020	174,674	$ 458	320,235	(2,909)	(143,110)
Balance (in shares) at Jul. 03, 2020		45,788
Net income	3,892				3,892
Other comprehensive income (loss)	(16)			(16)
Common stock issued upon exercise of options	4,429	$ 3	4,426
Common stock issued upon exercise of options (in shares)		269
Stock-based compensation	$ 3,413		3,413
Unvested restricted stock (in shares)	11	11
Vested restricted stock (in shares)		4
Balance at Oct. 02, 2020	$ 186,392	$ 461	328,074	(2,925)	(139,218)
Balance (in shares) at Oct. 02, 2020		46,072
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	19,579				19,579
Other comprehensive income (loss)	1,917			1,917
Common stock issued upon exercise of options	$ 18,322	$ 11	18,311
Common stock issued upon exercise of options (in shares)	1,089	1,089
Stock-based compensation	$ 12,067		12,067
Unvested restricted stock (in shares)	3	3
Vested restricted and performance stock	$ 1	$ 1
Vested restricted and performance stock (in shares)		59
Balance at Oct. 01, 2021	249,108	$ 476	368,572	(3,628)	(116,312)
Balance (in shares) at Oct. 01, 2021		47,599
Balance at Jul. 02, 2021	234,622	$ 474	360,316	(3,836)	(122,332)
Balance (in shares) at Jul. 02, 2021		47,391
Net income	6,020				6,020
Other comprehensive income (loss)	208			208
Common stock issued upon exercise of options	4,212	$ 2	4,210
Common stock issued upon exercise of options (in shares)		183
Stock-based compensation	$ 4,046		4,046
Unvested restricted stock (in shares)	3
Vested restricted and performance stock (in shares)		25
Balance at Oct. 01, 2021	$ 249,108	$ 476	$ 368,572	$ (3,628)	$ (116,312)
Balance (in shares) at Oct. 01, 2021		47,599