Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net loss	$ (27,953)	$ (25,463)	$ (159,606)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,006	4,430	10,177
Long-lived assets write-off due to restructuring	1,011
Goodwill and long-lived asset impairment			112,904
Change in fair value of contingent liability		(1,210)
Loss on disposal of fixed assets		163	181
Lease incentives			2,223
Provision for adjustments to accounts receivable and doubtful accounts	730	1,045	1,244
Provision for excess and obsolete inventory	76	73	158
Non cash compensation related to stock options and restricted stock	3,533	3,949	6,530
Deferred income taxes			414
Change in operating accounts:
Accounts receivable	660	(1,473)	20,043
Income tax receivable	(18)	7,612	(5,421)
Inventories	(67)	60	(97)
Prepaid expenses and other assets	(9)	268	58
Accounts payable and accrued liabilities	1,457	(2,259)	(2,355)
Net cash used in operating activities	(16,574)	(12,805)	(13,547)
Investing activities:
Capital expenditures	(829)	(322)	(13,431)
Sales of short-term investments	10,257	25,196	16,172
Net cash provided by investing activities	9,428	24,874	2,741
Financing activities:
Cash received from stock sale for employee stock purchase plan	36	66	413
Cash received from exercise of stock options		16	12
Repurchase of common stock		(753)
Net cash provided by (used in) financing activities	36	(671)	425
Net increase (decrease) in cash and cash equivalents	(7,110)	11,398	(10,381)
Cash and cash equivalents, beginning of period	18,873	7,475	17,856
Cash and cash equivalents, end of period	11,763	18,873	7,475
Supplemental disclosures of cash flow information:
Cash paid for income taxes	$ 165	$ 257	$ 700