Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Operating activities:
Net loss	$ (1,651)	$ (3,048)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	143	186
Change in fair value of earn-out liability		74
Stock-based compensation	95	615
Provision for doubtful accounts	42	25
Changes in operating assets and liabilities:
Accounts receivable	2,292	638
Inventories	(35)	66
Prepaid expenses and other current assets	(290)	(221)
Operating lease right-of-use assets	302	307
Other long-term assets	11	9
Accounts payable	(1,091)	(116)
Accrued compensation	(681)	(1,417)
Accrued expenses	1	(523)
Accrued warranty	(140)	(153)
Deferred revenue	(108)	43
Operating lease liabilities	(343)	(282)
Net cash used in operating activities	(1,453)	(3,797)
Investing activities:
Acquisition of property and equipment	(68)	(67)
Payment on earn-out liability		(96)
Net cash used in investing activities	(68)	(163)
Financing activities:
Taxes paid related to net share settlements of equity awards	(2)	(93)
Net cash (used in) provided by financing activities	(2)	(93)
Effect of foreign exchange rate changes	9	34
Net (decrease) increase in cash and cash equivalents	(1,514)	(4,019)
Cash and cash equivalents, beginning of period	12,653	21,194
Cash and cash equivalents, end of period	11,139	17,175
Supplemental disclosure of non-cash activities:
Transfer of inventory to property and equipment	$ 48	$ 17