CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net loss	$ (5,253)	$ (5,785)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	1,586	2,071
Non-cash interest	3,446	3,151
(Gain)/Loss on disposal of fixed assets	(23)	617
Non-cash compensation expense/stock option expense	364	230
Provision for losses on accounts receivable and inventory	39	313
Change in derivative warrant liability	38	(170)
Changes in operating assets and liabilities:
Accounts receivable	2,290	2,536
Inventories	(182)	261
Prepaid and other assets	660	(647)
Accounts payable	(1,884)	(1,743)
Accrued liabilities	(845)	(397)
Net cash provided by operating activities	236	437
Investing activities:
Purchases of property and equipment and intangible assets	(132)	(310)
Net cash used by investing activities	(132)	(310)
Financing activities:
Payments on capital leases	(79)	(63)
Payments on revolving line of credit	0	(155)
Expense associated with private placement and convertible debt conversion/exchange	(3,519)	0
Proceeds from issuance of stock	6,810	0
Net cash provided by (used by) financing activities	3,212	(218)
Net change in cash and cash equivalents	3,316	(91)
Cash and cash equivalents at beginning of period	2,856	2,578
Cash and cash equivalents at end of period	$ 6,172	$ 2,487