Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Operating activities:
Net (loss) income	$ (1,866)	$ 101
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	207	142
Change in fair value of earn-out liability	25	11
Stock-based compensation	392	222
Changes in operating assets and liabilities:
Accounts receivable	1,159	(15)
Inventories	(85)	(36)
Prepaid expenses and other current assets	(118)	(39)
Other long-term assets	5	16
Accounts payable	(50)	473
Accrued compensation	(777)	(289)
Accrued expenses	(541)	(70)
Accrued warranty	46	7
Deferred revenue	(22)
Other long-term liabilities	3	3
Net cash (used in) provided by operating activities	(1,622)	526
Investing activities:
Acquisition of property and equipment	(341)	(89)
Payment on earn-out liability	(84)	(96)
Net cash used in investing activities	(425)	(185)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	2,263
Proceeds from stock option exercises	163	245
Taxes paid related to net share settlements of equity awards	(268)	(8)
Repurchase of common stock		(59)
Net cash provided by financing activities	2,158	178
Net increase in cash and cash equivalents	111	519
Cash and cash equivalents, beginning of period	23,747	9,995
Cash and cash equivalents, end of period	$ 23,858	10,514
Cash paid during the period for:
Income taxes		$ 1