CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2013	$ 129,571	$ 24	$ 156,359	$ (1,688)	$ 725	$ (25,849)
Beginning Balance (in shares) at Dec. 31, 2013		23,767,000		241,000
Shares issued in connection with:
Exercise of stock options (in shares)		190,000
Exercise of stock options	$ 948		948
Settlement of RSUs (in shares)		72,000
Employee stock purchase plan (in shares)	444,000	444,000
Employee stock purchase plan	$ 1,611		1,611
Shares withheld in connection with net share settlement of RSUs (in shares)		(13,000)
Shares withheld in connection with net share settlement of RSUs	(92)		(92)
Equity-based compensation expense	2,445		2,445
Net loss	(27,445)					(27,445)
Other comprehensive loss	$ (106)				(106)
Common stock repurchases (in shares)	1,185,000	(1,185,000)		1,185,000
Common stock repurchases	$ (8,302)	$ (1)		$ (8,301)
Ending Balance at Jan. 03, 2015	98,630	$ 23	161,271	$ (9,989)	619	(53,294)
Ending Balance (in shares) at Jan. 03, 2015		23,275,000		1,426,000
Shares issued in connection with:
Exercise of stock options (in shares)		54,000
Exercise of stock options	$ 239		239
Settlement of RSUs (in shares)		113,000
Employee stock purchase plan (in shares)	374,000	374,000
Employee stock purchase plan	$ 1,460		1,460
Shares withheld in connection with net share settlement of RSUs (in shares)		(25,000)
Shares withheld in connection with net share settlement of RSUs	(132)		(132)
Equity-based compensation expense	3,296		3,296
Grant of RSUs to settle accrued bonus	380		380
Net loss	(9,166)					(9,166)
Other comprehensive loss	$ (207)				(207)
Common stock repurchases (in shares)	3,419,000	(3,419,000)		3,419,000
Common stock repurchases	$ (18,503)	$ (3)		$ (18,500)
Ending Balance at Jan. 02, 2016	$ 75,997	$ 20	166,514	$ (28,489)	412	(62,460)
Ending Balance (in shares) at Jan. 02, 2016		20,372,000		4,845,000
Shares issued in connection with:
Exercise of stock options (in shares)	8,553	9,000
Exercise of stock options	$ 38		38
Settlement of RSUs (in shares)		269,000
Employee stock purchase plan (in shares)	384,000	384,000
Employee stock purchase plan	$ 1,451	$ 1	1,450
Shares withheld in connection with net share settlement of RSUs (in shares)		(95,000)
Shares withheld in connection with net share settlement of RSUs	(426)		(426)
Equity-based compensation expense	3,254		3,254
Grant of RSUs to settle accrued bonus	484		484
Net loss	(7,441)					(7,441)
Other comprehensive loss	(91)				(91)
Ending Balance at Dec. 31, 2016	$ 73,266	$ 21	$ 171,314	$ (28,489)	$ 321	$ (69,901)
Ending Balance (in shares) at Dec. 31, 2016		20,939,000		4,845,000