Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Operating activities:
Net loss	$ (4,431)	$ (5,467)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	277	365
Change in fair value of earn-out liability		127
Stock-based compensation	531	1,240
Provision for doubtful accounts	101	25
Changes in operating assets and liabilities:
Accounts receivable	3,435	973
Inventories	278	(207)
Prepaid expenses and other current assets	(107)	(47)
Operating lease right-of-use assets	608	598
Other long-term assets	(7)	3
Accounts payable	(2,035)	(320)
Accrued compensation	(845)	(811)
Accrued expenses	(100)	(505)
Accrued warranty	(162)	(284)
Deferred revenue	(286)	(242)
Operating lease liabilities	(696)	(609)
Net cash used in operating activities	(3,439)	(5,161)
Investing activities:
Acquisition of property and equipment	(79)	(111)
Payment on earn-out liability		(199)
Net cash used in investing activities	(79)	(310)
Financing activities:
Proceeds from PPP loan	2,497
Taxes paid related to net share settlements of equity awards	(4)	(101)
Net cash provided by (used in) financing activities	2,493	(101)
Effect of foreign exchange rate changes	(4)	11
Net decrease in cash and cash equivalents	(1,029)	(5,561)
Cash and cash equivalents, beginning of period	12,653	21,194
Cash and cash equivalents, end of period	11,624	15,633
Supplemental disclosure of cash flow information:
Cash paid during the period for income taxes	21	19
Supplemental disclosure of non-cash activities:
Transfer of inventory to property and equipment	$ 49	$ 26