Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net loss	$ (8,799)	$ (9,932)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation and amortization	529	509
Provision for bad debts	111	230
Provision for inventory excess and obsolescence		59
Amortization of discounts on lines of credit	109	17
Amortization of debt issuance costs	86	25
Stock-based compensation	1,204	1,258
Deferred income taxes	(5)	2
Earned interest income		(1)
Changes in operating assets and liabilities:
Accounts receivable	1,263	(504)
Inventory	(86)	(1,769)
Prepaid expenses and other current assets	644	105
Accounts payable and accrued liabilities	(1,720)	2,074
Deferred revenue	37	(418)
Net cash and cash equivalents used in operating activities	(6,627)	(8,345)
Cash Flows from Investing Activities:
Purchases of property, plant, and equipment	(125)	(110)
Net cash and cash equivalents used in investing activities	(125)	(110)
Cash Flows from Financing Activities:
Principal payments under capital lease obligation		(46)
Borrowings under line of credit		1,823
Payments under line of credit		(1,823)
Borrowings under term loan	2,500
Payments of debt issuance costs	(38)	(87)
Payments of equity offering costs		(138)
Proceeds from exercise of stock options	4	2
Net cash and cash equivalents provided by (used in) financing activities	2,466	(269)
Effect of exchange rate changes	(38)	(26)
Decrease in cash, cash equivalents and restricted cash	(4,324)	(8,750)
Cash, cash equivalents and restricted cash, beginning of period	8,356	11,896
Cash, cash equivalents and restricted cash, end of period	4,032	3,146
Supplemental cash flow disclosure:
Cash paid for interest	831
Cash paid for income taxes	12	$ 15
Cash paid for operating leases	414
Non-cash accrual for capital expenditures	17
Non-cash right-of-use assets obtained in exchange for lease obligation	824
Warrants issued in connection with debt instruments	$ 209