Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 130	$ 1,064
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24	52
Loss on disposal of assets	26
Provision for recovery of bad debts and returns, net		(4)
Provision for inventory obsolescence	137	133
Amortization of right of use	137
Changes in operating assets and liabilities:
Accounts receivable	(429)	(142)
Inventories	16	(248)
Prepaid expenses and other current assets	39	(12)
Accounts payable	342	(9)
Accrued payroll and related liabilities	18	127
Deferred service revenue	(77)	(138)
Lease liabilities	(133)
Other accrued liabilities	(72)	(3)
Total adjustments	28	(244)
Net cash provided by operating activities	158	820
Cash flows from investing activities:
Purchases of equipment	(44)	(10)
Net cash used in investing activities	(44)	(10)
Cash flows from financing activities:
Proceeds from the exercise of stock options		39
Purchase of common stock	(519)
Net cash provided by (used in) financing activities	(519)	39
Net increase (decrease) in cash, restricted cash and cash equivalents	(405)	849
Cash, restricted cash and cash equivalents at beginning of period	4,881	4,798
Cash, restricted cash and cash equivalents at end of period	4,476	5,647
Supplemental cash flow disclosures:
Income taxes paid	$ 10	$ 24