Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 179	$ 1,469
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35	69
Loss on disposal of assets	30
Provision for recovery of bad debts and returns, net		1
Provision for inventory obsolescence	237	227
Amortization of right of use	(338)
Changes in operating assets and liabilities:
Accounts receivable	(368)	(245)
Inventories	(68)	(1,381)
Prepaid expenses and other current assets	(84)	(75)
Accounts payable	302	17
Accrued payroll and related liabilities	(8)	153
Deferred service revenue	65	(109)
Lease liabilities	349
Other accrued liabilities	(120)	(14)
Total adjustments	32	(1,357)
Net cash provided by operating activities	211	112
Cash flows from investing activities:
Purchases of equipment	(85)	(18)
Net cash used in investing activities	(85)	(18)
Cash flows from financing activities:
Proceeds from the exercise of stock options		39
Purchase of common stock	(636)
Net cash provided by (used in) financing activities	(636)	39
Net increase (decrease) in cash, restricted cash and cash equivalents	(510)	133
Cash, restricted cash and cash equivalents at beginning of period	4,881	4,798
Cash, restricted cash and cash equivalents at end of period	4,371	4,931
Supplemental cash flow disclosures:
Income taxes paid	$ 10	$ 32