Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 3,626	$ (1,763)
Reconciliation of Net Income (Loss) to Net Cash Provided by Operating Activities:
Amortization of debt discount	22	138
Accretion of non-cash interest	200	109
Loss on extinguishment of debt		179
Depreciation	373	409
Loss on disposal of property and equipment	2	(1)
Loss on disposal of assets for lease	150	200
Allowance for doubtful accounts	39	7
Stock-based compensation expense	470	253
Changes in Operating Assets and Liabilities:
Trade accounts receivable	(1,165)	(607)
Prepaid expenses and other current assets	(60)	(65)
Accounts payable	(237)	197
Accrued expenses	(609)	763
Deferred revenue	(160)	362
Net Cash Provided By Operating Activities	2,651	181
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment	(131)	(24)
Proceeds from disposal of property and equipment	1	2
Purchase of assets for lease	(323)	(764)
Net Cash Used in Investing Activities	(453)	(786)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock		475
Exercise of warrants	64
Exercise of stock options	440	78
Proceeds from loans payable		114
Payments of loans payable	(1,072)	(106)
Net Cash (Used in) Provided by Financing Activities	(568)	561
INCREASE (DECREASE) IN CASH	1,630	(44)
CASH, BEGINNING OF PERIOD	1,457	622
CASH, END OF PERIOD	3,087	578
Cash paid for interest	192	10
Supplemental disclosure of noncash financing activity:
Retirement of related party loans payable through common stock issuance	$ 294
Reclassification of accrued interest to debt upon extinguishment		162
Fair value of warrants issued to lenders		$ 288