Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (1,509)	$ (1,016)
Allowance for doubtful accounts and returns	(21)	14
Writedowns of excess and obsolete inventories	7	14
Depreciation and amortization	92	58
Amortization of stock-based compensation	164	123
Loss on retirement of machinery and equipment		14
Realized gain on marketable securities	(1)
Trade accounts receivable	179	293
Inventories	(19)	(251)
Prepaid expenses and other current assets	(74)	(597)
Other assets	(27)	(54)
Accounts payable, deferred revenue and accrued liabilities	(92)	123
Accrued compensation	77	(58)
Deferred lease obligations	(73)	568
Net cash used in operating activities	(1,297)	(769)
Cash flows from investing activities:
Purchases of property and equipment	(4)	(646)
Purchases of capitalized software		(1)
Proceeds from the sale of marketable securities	3,579	4,514
Purchases of marketable securities		(4,010)
Net cash provided by (used in) investing activities	3,575	(143)
Cash flows from financing activities:
Borrowings under credit facility		3,500
Payments on credit facility	(3,500)	(3,500)
Net cash used in financing activities	(3,500)
Effect of exchange rate changes on cash and cash equivalents		(1)
Net decrease in cash and cash equivalents	(1,222)	(913)
Cash and cash equivalents at beginning of period	3,517	1,478
Cash and cash equivalents at end of period	$ 2,295	$ 565