Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018		Jul. 01, 2017
Operating activities:
Net loss	$ (6,883)		$ (4,616)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	395		417
Change in fair value of earn-out liability	55		61
Stock-based compensation	843		836
Provision for doubtful accounts			10
Changes in operating assets and liabilities:
Accounts receivable	721		2,966
Inventories	282		255
Prepaid expenses and other current assets	(153)		(38)
Other long-term assets	(30)		31
Accounts payable	519		(214)
Accrued compensation	(67)		(188)
Accrued expenses	145		(325)
Accrued warranty	(809)		63
Deferred revenue	(204)		(38)
Other long-term liabilities	133		31
Net cash used in operating activities	(5,053)		(749)
Investing activities:
Acquisition of property and equipment	(374)		(436)
Payment on earn-out liability	(186)		(178)
Net cash used in investing activities	(560)		(614)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs			2,263
Proceeds from stock option exercises	62		215
Taxes paid related to net share settlements of equity awards	(152)		(268)
Net cash (used in) provided by financing activities	(90)		2,210
Effect of foreign exchange rate changes	41
Net (decrease) increase in cash and cash equivalents	(5,662)		847
Cash and cash equivalents, beginning of period	21,707	[1]	23,747
Cash and cash equivalents, end of period	16,045		24,594
Cash paid during the period for:
Income taxes	9		$ 15
Supplemental disclosure of non-cash activities:
Transfer of inventory to property and equipment	$ 6

[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 30, 2017.