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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 10	$ 348
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	72	169
Stock-based compensation	(4)	94
Amortization of intangible assets		27
Amortization of debt issuance costs		12
Accrued interest	54	209
Other	(2)
Changes in assets and liabilities
Accounts receivable	(549)	406
Inventories	246	(134)
Prepaid expenses and other assets	(248)	93
Accounts payable	(21)	63
Deferred revenue and other liabilities	(284)	(1,604)
Net cash used in operating activities	(726)	(317)
Cash flows from investing activities:
Purchases of property and equipment	(48)
Purchases of marketable securities	(1,564)
Net cash used in investing activities	(1,612)
Cash flows from financing activities:
Issuance costs for sale of common stock		(12)
Taxes paid to net share settle equity awards	(1)	(38)
Net cash used in financing activities	(1)	(50)
Net decrease in cash and cash equivalents	(2,339)	(367)
Cash and cash equivalents at beginning of period	7,104	3,868
Cash and cash equivalents at end of period	4,765	3,501
Supplemental disclosure:
Issuance of convertible notes in settlement of accrued interest	$ 78	$ 463

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