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	$ (6,375)	$ (9,623)
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	1,016	1,798
(Gain) loss on disposal of property and equipment	(66)	108
Gain on sale of Hungarian subsidiary	(760)	0
Stock-based compensation	1,229	1,472
(Accretion of discount) amortization of premium on marketable securities	1	(43)
Changes in operating assets and liabilities:
Accounts receivable	550	133
Inventories	(557)	(384)
Prepaid expenses and other current assets	(813)	1,301
Other assets	8	(464)
Accounts payable	(472)	792
Accrued compensation	162	656
Other accrued liabilities	1,279	(2,197)
Deferred revenues	1,549	2,120
Net cash used in operating activities	(2,405)	(3,487)
Investing activities:
Purchase of property and equipment	(21)	(48)
Proceeds from maturities of marketable securities	2,000	2,500
Proceeds from sale of Hungarian subsidiary, net of selling costs	1,500	0
Proceeds from the sale of assets held for sale	10	0
Proceeds from sale of property and equipment	117	0
Net cash provided by investing activities	3,606	2,452
Financing activities:
Proceeds from exercises of stock options	62	263
Taxes paid related to net share settlement of equity awards	(230)	0
Net cash provided by (used in) financing activities	(168)	263
Net increase (decrease) in cash and cash equivalents	1,033	(772)
Cash and cash equivalents at the beginning of the period	22,130	32,003
Cash and cash equivalents at the end of the period	$ 23,163	$ 31,231