STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income/loss	$ 46	$ (610)
Adjustment to reconcile net income/loss to net cash used in operating activities:
Depreciation and amortization	96	182
Share-based compensation	48	47
Changes in assets and liabilities related to operations:
Trade accounts receivable	(836)	(423)
Inventories	32	(96)
Prepaid expenses and other assets	104	(50)
Accounts payable	267	210
Accrued expenses	85	42
Net cash used in operating activities	(158)	(698)
Investing activities:
Proceeds from disposal of equipment	30
Acquisition of equipment and leasehold improvements	(55)	(27)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements		(37)
Net cash provided by/(used in) investing activities	(25)	(64)
Financing activities:
Principal payments on capital leases	(71)	(23)
Proceeds from exercise of stock options	2
Proceeds from common stock issuance		988
Net cash (used in)/provided by financing activities	(69)	965
(Decrease)/increase in cash and cash equivalents	(252)	203
Cash and cash equivalents at beginning of period	1,779	1,275
Cash and cash equivalents at end of period	1,527	1,478
Supplemental cash flow information:
Interest paid	10	4
Supplemental non-cash investing and financing activities:
Receivable from sale of property and equipment	70
Proceeds from capital lease	175
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 28	$ 34