Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (2,782)	$ (2,144)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for doubtful accounts and returns	(18)	17
Writedowns of excess and obsolete inventories	25	14
Depreciation and amortization	185	142
Amortization of stock-based compensation	219	241
Loss on retirement of machinery and equipment	3	$ 14
Realized gain on marketable securities	(1)
Change in assets and liabilities:
Trade accounts receivable	542	$ (330)
Inventories	181	(201)
Prepaid expenses and other current assets	15	23
Other assets	(86)	(22)
Accounts payable, deferred revenue and accrued liabilities	(525)	265
Accrued compensation	120	83
Deferred lease obligations	(148)	1,308
Net cash used in operating activities	(2,270)	(590)
Cash flows from investing activities:
Purchases of property and equipment	$ (5)	(1,520)
Purchases of capitalized software		(10)
Proceeds from the sale of marketable securities	$ 3,579	8,565
Purchases of marketable securities		(7,410)
Net cash provided by (used in) investing activities	$ 3,574	(375)
Cash flows from financing activities:
Borrowings under credit facility		7,000
Payments on credit facility	$ (3,500)	(7,000)
Proceeds from the exercise of stock options		3
Net cash (used in) provided by financing activities	$ (3,500)	3
Effect of exchange rate changes on cash and cash equivalents	(1)	(1)
Net decrease in cash and cash equivalents	(2,197)	(963)
Cash and cash equivalents at beginning of period	3,517	1,478
Cash and cash equivalents at end of period	$ 1,320	$ 515