Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Comprehensive Income [Member]
Beginning Balance Value at Dec. 27, 2008	$ 92,767	$ 18	$ 189,927	$ (96,643)	$ (535)
Beginning Balance Shares at Dec. 27, 2008		18,413,054
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(16,305)			(16,305)		(16,305)
Employee benefit plan adjustment	110				110	110
Foreign currency translation adjustments	1,798				1,798	1,798
Comprehensive income (loss)						(14,397)
Issuance of common stock under stock-based compensation plans, Shares		786,585
Issuance of common stock under stock-based compensation plans, Value	3,038	1	3,037
Common stock offering, net of $426 offering costs, Shares		2,307,152
Common stock offering, net of $426 offering costs, Value	23,292	2	23,290
Share-based compensation expense	2,054		2,054
Ending Balance Value at Jan. 02, 2010	106,754	21	218,308	(112,948)	1,373
Ending Balance Shares at Jan. 02, 2010		21,506,791
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	55,948			55,948		55,948
Employee benefit plan adjustment	(51)				(51)	(51)
Foreign currency translation adjustments	750				750	750
Comprehensive income (loss)						56,647
Issuance of common stock under stock-based compensation plans, Shares		969,484
Issuance of common stock under stock-based compensation plans, Value	6,623	1	6,622
Common stock offering costs	(28)		(28)
Share-based compensation expense	2,950		2,950
Repurchases and retirement of common stock, Shares		(161,492)
Repurchases and retirement of common stock, Value	(2,097)		(2,097)
Ending Balance Value at Jan. 01, 2011	170,849	22	225,755	(57,000)	2,072
Ending Balance Shares at Jan. 01, 2011	22,314,783	22,314,783
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	28,685			28,685		28,685
Employee benefit plan adjustment	(39)				(39)	(39)
Foreign currency translation adjustments	(484)				(484)	(484)
Comprehensive income (loss)						28,162
Issuance of common stock under stock-based compensation plans, Shares		1,133,028
Issuance of common stock under stock-based compensation plans, Value	10,765	1	10,764
Share-based compensation expense	4,473		4,473
Repurchases and retirement of common stock, Shares		(265,040)
Repurchases and retirement of common stock, Value	(4,257)		(4,257)
Ending Balance Value at Dec. 31, 2011	$ 209,992	$ 23	$ 236,735	$ (28,315)	$ 1,549
Ending Balance Shares at Dec. 31, 2011	23,182,771	23,182,771