Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net loss	$ (19,416)	$ (31,489)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of intangible assets	2,531	2,531
Depreciation and amortization of property and equipment	2,679	5,307
Impairment of property and equipment	1,841	0
Change in fair value of assets held for sale	886	0
(Gain) loss on disposal of property and equipment	(115)	62
Gain on sale of Hungarian subsidiary	(760)	0
Stock-based compensation	3,630	3,361
Amortization of premium (accretion of discount) on marketable securities	2	(63)
Bad debt expense	53	328
Changes in operating assets and liabilities:
Accounts receivable	2,316	833
Inventories, net	(456)	(614)
Prepaid expenses and other current assets	(734)	4
Other assets	(74)	(37)
Accounts payable	(1,418)	(2,164)
Accrued compensation	(1,100)	(155)
Other accrued liabilities	194	1,080
Deferred revenue	5,288	1,923
Net cash used in operating activities	(4,653)	(19,093)
Investing activities:
Purchase of property and equipment	(267)	(447)
Proceeds from maturities of marketable securities	3,000	13,410
Proceeds from sale of Hungarian subsidiary, net of selling costs	1,500	0
Proceeds from the sale of assets held for sale	281	0
Proceeds from sale of property and equipment	166	150
Decrease in restricted cash	0	600
Net cash provided by investing activities	4,680	13,713
Financing activities:
Proceeds from exercises of options to purchase common stock	180	288
Taxes paid related to net share settlement of equity awards	(815)	0
Net cash provided by (used in) financing activities	(635)	288
Net decrease in cash and cash equivalents	(608)	(5,092)
Cash and cash equivalents at the beginning of the period	22,130	32,003
Cash and cash equivalents at the end of the period	$ 21,522	$ 26,911