Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Operating activities:
Net loss	$ (12,813)	$ (12,867)
Adjustments to reconcile net loss to net cash used in operating activities:
Gain on sale of intellectual property		(175)
Impairment of long-lived assets		35
Loss on disposal of property and equipment	4
Depreciation and amortization	809	858
Change in fair value of earn-out liability	149	260
Stock-based compensation	1,803	1,922
Changes in operating assets and liabilities:
Accounts receivable	(1,159)	2,162
Inventories	463	2,091
Prepaid expenses and other current assets	(54)	(50)
Other long-term assets	(49)	(63)
Accounts payable	788	(270)
Accrued compensation	503	113
Accrued expenses	614	25
Accrued warranty	(875)	1,132
Deferred revenue	(295)	1,137
Other long-term liabilities	87	125
Net cash used in operating activities	(10,025)	(3,565)
Investing activities:
Acquisition of property and equipment	(440)	(575)
Proceeds from sale of intellectual property		175
Payment on earn-out liability	(387)	(382)
Net cash used in investing activities	(827)	(782)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	10,475	2,263
Proceeds from stock option exercises	98	377
Taxes paid related to net share settlements of equity awards	(194)	(333)
Net cash provided by financing activities	10,379	2,307
Effect of foreign exchange rate changes	(40)
Net decrease in cash and cash equivalents	(513)	(2,040)
Cash and cash equivalents, beginning of year	21,707	23,747
Cash and cash equivalents, end of year	21,194	21,707
Cash paid during the year for:
Income taxes	13	7
Supplemental disclosure of non-cash activities:
Transfer of inventory to property and equipment	$ 166	$ 171