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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (93)	$ 663
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	111	340
Stock-based compensation	115	252
Amortization of intangible assets		55
Amortization of debt issuance costs		24
Accrued interest	110	403
Other	(7)
Changes in assets and liabilities
Accounts receivable	267	207
Inventories	547	(528)
Prepaid expenses and other assets	(21)	920
Accounts payable	(148)	58
Deferred revenue and other liabilities	(490)	(2,592)
Net cash provided by (used in) operating activities	391	(198)
Cash flows from investing activities:
Purchases of property and equipment	(55)	(25)
Proceeds from maturities of short-term investments	500
Purchases of short-term investments	(1,567)
Net cash used in investing activities	(1,122)	(25)
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	(732)	(273)
Cash and cash equivalents at beginning of period	7,104	3,868
Cash and cash equivalents at end of period	6,372	3,595
Supplemental disclosure:
Issuance of convertible notes in settlement of accrued interest	$ 78	$ 463

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