CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect Period of Adoption Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect Period of Adoption Adjustment	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Accumulated Deficit Cumulative Effect Period of Adoption Adjustment
Balance at Dec. 28, 2018	$ 132,426		$ 442	$ 289,584		$ (1,320)	$ (156,280)
Balance (Lease Accounting Standard) at Dec. 28, 2018		$ 113						$ 113
Balance (Nonemployee Share-Based Payment Standard) at Dec. 28, 2018					$ (315)			$ 315
Balance (in shares) at Dec. 28, 2018			44,195
Net income	14,048						14,048
Other comprehensive income (loss)	(1,728)					(1,728)
Common stock issued upon exercise of options	3,459		$ 4	3,455
Common stock issued upon exercise of options (in shares)			387
Stock-based compensation	$ 11,564			11,564
Unvested restricted stock (in shares)	(11)		11
Vested restricted stock	$ 2		$ 2
Vested restricted stock (in shares)			229
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	5,913						5,913
Other comprehensive income (loss)	(2,497)					(2,497)
Common stock issued upon exercise of options	20,646		$ 15	20,631
Common stock issued upon exercise of options (in shares)			1,507
Stock-based compensation	$ 13,275			13,275
Unvested restricted stock (in shares)	(11)		11
Vested restricted stock	$ 1		$ 1
Vested restricted stock (in shares)			108
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	24,501						24,501
Other comprehensive income (loss)	1,497					1,497
Common stock issued upon exercise of options	$ 19,437		$ 12	19,425
Common stock issued upon exercise of options (in shares)	1,206		1,206
Stock-based compensation	$ 15,900			15,900
Unvested restricted stock (in shares)	(3)		3
Vested restricted stock	$ 1		$ 1
Vested restricted stock (in shares)			59
Balance at Dec. 31, 2021	$ 258,558		$ 477	$ 373,519		$ (4,048)	$ (111,390)
Balance (in shares) at Dec. 31, 2021			47,716