Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net loss	$ (3,757)	$ (1,453)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Depreciation	153	211
Amortization	389	341
Stock-based compensation	87	55
Changes in operating assets and liabilities:
Accounts receivable, net	967	1,424
Inventories	218	393
Prepaid expenses and current assets	259	(1,673)
Accounts payable	(683)	406
Accrued liabilities	(868)	57
Net cash used for operating activities	(3,235)	(239)
Investing activities:
Sales and maturities of marketable securities	2,639	1,092
Purchases of marketable securities		(776)
Purchases of property and equipment	(81)	(117)
Purchase of other investments		(300)
Capitalized software development costs		(157)
Net cash provided by (used for) investing activities	2,558	(258)
Financing activities:
Proceeds from exercise of stock options
Net cash provided by financing activities
Effect of exchange rate changes on cash	43	(301)
Decrease in cash and cash equivalents	(634)	(798)
Cash and cash equivalents at beginning of period	3,564	8,334
Cash and cash equivalents at end of period	$ 2,930	$ 7,536