Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net loss	$ (19,071,000)	$ (41,303,000)	$ (30,857,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of intangible assets	3,374,000	3,374,000	3,509,000
Depreciation and amortization of property and equipment	3,311,000	6,944,000	8,908,000
Accretion of asset retirement obligation	0	0	30,000
Stock-based compensation	4,620,000	4,389,000	5,076,000
Accretion of premium on marketable securities	2,000	42,000	697,000
Loss on disposal of property and equipment	24,000	0	1,551,000
Impairment of property and equipment	1,841,000	1,582,000	0
Gain on sale of Hungarian subsidiary	(760,000)	0	0
Loss on disposal and exchange of Assets Held for Sale, net	87,000	0	0
Change in fair value of assets held for sale	698,000	0	0
Other than temporary change in marketable securities	0	0	753,000
Gain from extinguishment of asset retirement obligation	0	0	(212,000)
Common stock issuances for royalty payment to a licensor	0	0	68,000
Changes in operating assets and liabilities:
Accounts receivable	1,587,000	1,629,000	11,372,000
Inventories	92,000	(185,000)	3,186,000
Prepaid expenses and other current assets	(339,000)	850,000	(3,051,000)
Other assets	(78,000)	337,000	(1,330,000)
Accounts payable	713,000	308,000	(6,710,000)
Accrued compensation	(530,000)	130,000	(3,290,000)
Other accrued liabilities	555,000	(2,724,000)	197,000
Deferred revenues	4,195,000	1,629,000	(1,789,000)
Net cash provided by (used in) operating activities	321,000	(22,998,000)	(11,892,000)
Investing activities:
Purchase of property and equipment	(302,000)	(1,175,000)	(2,933,000)
Proceeds from disposal of property and equipment	167,000	238,000	0
Proceeds from sale of Hungarian subsidiary	1,500,000	0	0
Proceeds from sale of assets held for sale	282,000	0	0
Purchase of marketable securities	0	0	(20,638,000)
Proceeds from sale of marketable securities	3,000,000	0	10,397,000
Proceeds from maturities of marketable securities	0	13,409,000	29,885,000
Decrease in restricted cash	0	800,000	0
Net cash provided by investing activities	4,647,000	13,272,000	16,711,000
Financing activities:
Proceeds from exercises of stock options	195,000	318,000	1,257,000
Proceeds from issuance of common stock, net of issuance costs	9,000	0	0
Taxes paid related to net share settlement of equity awards	(815,000)	(465,000)	0
Net cash provided by (used in) financing activities	(611,000)	(147,000)	1,257,000
Effect of exchange rate changes on cash and cash equivalents	0	0	165,000
Net increase (decrease) in cash and cash equivalents	4,357,000	(9,873,000)	6,241,000
Cash and cash equivalents at the beginning of the year	22,130,000	32,003,000	25,762,000
Cash and cash equivalents at the end of the year	26,487,000	22,130,000	32,003,000
Supplemental disclosures of cash flow information:
Cash paid for income taxes	15,000	103,000	126,000
Long term deposit in other assets transferred to property and equipment	0	1,857,000	0
Equipment in property and equipment transferred to (from) assets held for sale	$ (333,000)	$ 2,179,000	$ 0