Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$ 1,486	$ 640
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	86	154
Loss on disposal of assets		5
(Recovery) of doubtful accounts, net	3	(7)
Provision for inventory reserve	362	364
Share-based compensation		413
Changes in operating assets and liabilities:
Accounts receivable	(10)	(212)
Inventories	(1,695)	(568)
Prepaid expenses and other assets	(68)	11
Accounts payable	(42)	177
Accrued payroll and related liabilities	12	(49)
Deferred service revenue	(64)	35
Other accrued liabilities	93	84
Net cash provided by (used in) operating activities	163	1,047
CASH FLOW FROM INVESTING ACTIVITIES:
Purchases of equipment	(26)	(44)
Net cash provided by (used in) investing activities	(26)	(44)
CASH FLOW FROM FINANCING ACTIVITIES:
Purchase of common stock	(93)
Proceeds from the exercise of stock options	39	4
Net cash provided by (used in) financing activities	(54)	4
NET INCREASE IN CASH, RESTRICTED CASH AND CASH EQUIVALENTS	83	1,007
CASH, RESTRICTED CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	4,798	3,791
CASH, RESTRICTED CASH AND CASH EQUIVALENTS, END OF PERIOD	4,881	4,798
SUPPLEMENTAL CASH FLOW DISCLOSURES:
Income taxes paid	$ 32	$ 3