Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net loss	$ (2,799)	$ (5,253)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	776	1,586
Loss/(gain) on disposal of fixed assets	116	(23)
Non-cash interest	1,991	3,446
Non-cash consulting expense/stock option expense	122	364
Provision for losses on accounts receivable and inventory	247	39
Change in derivative warrant liability	15	38
Changes in operating assets and liabilities:
Accounts receivable	403	2,290
Inventories	623	(182)
Prepaid and other assets	146	660
Accounts payable	(429)	(1,884)
Accrued liabilities	(721)	(845)
Net cash provided by operating activities	490	236
Investing activities:
Purchases of property and equipment and intangible assets	(137)	(132)
Proceeds from sale of fixed assets	51
Net cash used in investing activities	(86)	(132)
Financing activities:
Payments on financing leases	(104)	(79)
Expense associated with private placement and convertible debt conversion/exchange		(3,519)
Proceeds from issuance of stock		6,810
Net cash (used in) provided by financing activities	(104)	3,212
Net change in cash and cash equivalents	300	3,316
Cash and cash equivalents at beginning of period	6,797	2,856
Cash and cash equivalents at end of period	$ 7,097	$ 6,172