Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (7)	$ 1,486
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	45	86
Loss on disposal of assets	31
Provision for (recovery of) doubtful accounts, net	(16)	3
Provision for inventory reserve	418	362
Share-based compensation	139
Amortization of right of use	(280)
Changes in assets and liabilities:
Accounts receivable	(541)	(10)
Inventories	(61)	(1,695)
Prepaid expenses and other assets	(73)	(68)
Accounts payable	6	(42)
Accrued payroll and related liabilities	7	12
Deferred service revenue	86	(64)
Lease liabilities	287
Other accrued liabilities	(157)	93
Net cash provided by (used in) operating activities	(116)	163
Cash flows from investing activities:
Purchases of equipment	(85)	(26)
Net cash provided by (used in) investing activities	(85)	(26)
Cash flow from financing activities:
Purchase of common stock	(717)	(93)
Proceeds from the exercise of stock options		39
Net cash provided by (used in) financing activities	(717)	(54)
Net increase (decrease) in cash, restricted cash and cash equivalents	(918)	83
Cash, restricted cash and cash equivalents, beginning of period	4,881	4,798
Cash, restricted cash and cash equivalents, end of period	3,963	4,881
Supplemental disclosure of cash flow information:
Income taxes paid	$ 11	$ 32