CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (1,207)	$ (2,993)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	371	356
Provision for inventory obsolescence	(52)	83
(Loss) gain on disposal of property and equipment, net	(1)	2
Stock based compensation	749	341
Change in fair value of derivative liabilities	(20)	(126)
Provision for allowance for doubtful accounts	82	159
Changes in current assets and liabilities:
Trade receivables	(817)	(355)
Prepaid expenses	(72)	(125)
Inventories	(955)	(1,507)
Deposits and other assets	(23)	(72)
Accounts payable	1,162	471
Accrued and other liabilities	(898)	(128)
Net cash used in operating activities	(1,681)	(3,894)
Cash flows from investing activities
Purchases of technology, property and equipment	(332)	(151)
Net cash used in investing activities	(332)	(151)
Cash flows from financing activities
Repayment of mortgage note payable	(120)	(119)
Net cash used in financing activities	(120)	(119)
Net change in cash, cash equivalents and restricted cash	(2,133)	(4,164)
Cash, cash equivalents and restricted cash, beginning of period	10,668	15,235
Cash, cash equivalents and restricted cash, end of period	8,535	11,071
Cash paid for:
Interest paid	$ 72	$ 67