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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 663	$ (8,399)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	340	389
Stock-based compensation	252	356
Amortization of intangible assets	55	56
Amortization of debt issuance costs	24	22
Accrued interest	403	430
Changes in assets and liabilities
Accounts receivable	207	37
Inventories	(528)	403
Prepaid expenses and other assets	920	(653)
Accounts payable	58	(407)
Deferred revenue and other liabilities	(2,592)	763
Net cash used in operating activities	(198)	(7,003)
Cash flows from investing activities:
Purchases of property and equipment	(25)
Proceeds from sales and maturities of marketable securities		2,604
Purchases of marketable securities		(1,602)
Net cash provided by (used in) investing activities	(25)	1,002
Cash flows from financing activities:
Issuance costs for sale of common stock	(12)	(22)
Taxes paid to net share settle equity awards	(38)
Net cash used in financing activities	(50)	(22)
Net decrease in cash and cash equivalents	(273)	(6,023)
Cash and cash equivalents at beginning of period	3,868	8,766
Cash and cash equivalents at end of period	3,595	2,743
Supplemental disclosure:
Issuance of convertible notes in settlement of accrued interest	$ 463	$ 420

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