Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Operating activities:
Net (loss) income	$ (11,713)	$ 474	$ 10,038
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Impairment of intangible assets	120
Depreciation and amortization	648	522	420
Change in fair value of earn-out liability	95	5	1,258
Stock-based compensation	1,821	895	972
Deferred income taxes	8,985	(209)	(8,776)
Excess tax benefits from stock-based awards			(36)
Provision for doubtful accounts	122	62	86
Changes in operating assets and liabilities:
Accounts receivable	(865)	(1,007)	(1,078)
Inventories	(537)	(1,987)	1,486
Prepaid expenses and other current assets	(64)	124	66
Other long-term assets	84	57	82
Accounts payable	(229)	465	(520)
Accrued compensation	774	(291)	(28)
Accrued expenses	478	(36)	17
Accrued warranty		134	1
Deferred revenue	72	132	46
Other long-term liabilities	65	67	(20)
Net cash (used in) provided byoperating activities	(144)	(593)	4,014
Investing activities:
Acquisition of property and equipment	(1,062)	(875)	(568)
Payment on earn-out liability	(406)	(423)	(459)
Net cash used in investing activities	(1,468)	(1,298)	(1,027)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	14,813
Proceeds from stock option exercises	709	1,027	1,501
Excess tax benefits from stock-based awards	0	0	36
Taxes paid related to net share settlements of equity awards	(99)	(606)
Repurchase of employee share awards		(275)
Repurchase of common stock	(59)	(1,563)	(4,665)
Net cash provided by (used in) financing activities	15,364	(1,417)	(3,128)
Net increase (decrease) in cash and cash equivalents	13,752	(3,308)	(141)
Cash and cash equivalents, beginning of year	9,995	13,303	13,444
Cash and cash equivalents, end of year	23,747	9,995	13,303
Cash paid during the year for:
Income taxes	$ 22	$ 27	$ 35