Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net loss	$ (5,562)	$ (6,375)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of intangible assets	844	844
Depreciation and amortization of property and equipment	558	1,016
Gain on disposal of property and equipment	(5)	(66)
Gain on sale of Hungarian subsidiary	0	(760)
Stock-based compensation	1,285	1,229
Amortization of premium on marketable securities	1	1
Changes in operating assets and liabilities:
Accounts receivable	655	550
Inventories, net	403	(557)
Prepaid expenses and other current assets	(11)	(813)
Other assets	1	8
Accounts payable	(2,721)	(472)
Accrued compensation	654	162
Other accrued liabilities	(663)	1,279
Deferred revenue	723	1,549
Net cash used in operating activities	(3,838)	(2,405)
Investing activities:
Purchase of property and equipment	(62)	(21)
Proceeds from maturities of marketable securities	0	2,000
Proceeds from sale of Hungarian subsidiary, net of selling costs	0	1,500
Proceeds from the sale of assets held for sale	0	10
Proceeds from sale of property and equipment	5	117
Net cash provided by (used in) investing activities	(57)	3,606
Financing activities:
Proceeds from exercises of options to purchase common stock	124	62
Taxes paid related to net share settlement of equity awards	(557)	(230)
Net cash used in financing activities	(433)	(168)
Net increase (decrease) in cash and cash equivalents	(4,328)	1,033
Cash and cash equivalents at the beginning of the period	26,487	22,130
Cash and cash equivalents at the end of the period	$ 22,159	$ 23,163