Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net loss	$ (16,507)	$ (15,600)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,218	5,812
Loss on disposal of fixed assets	161	102
Lease incentives		2,223
Provision for doubtful accounts and other adjustments to accounts receivable	585	308
Provision for excess and obsolete inventory	33	63
Excess tax benefits from stock-based compensation		(157)
Non-cash compensation related to stock options and restricted stock	2,154	3,976
Change in operating accounts:
Accounts receivable	(445)	17,433
Income tax receivable	606	(176)
Deferred taxes		(10,613)
Inventories	40	(19)
Prepaid expenses and other assets	(383)	(786)
Accounts payable and accrued liabilities	(2,445)	(2,316)
Net cash provided by (used in) operating activities	(13,983)	250
Investing activities:
Capital expenditures	(78)	(11,332)
Sales of short-term investments	18,239	9,809
Net cash provided by (used in) investing activities	18,161	(1,523)
Financing activities:
Excess tax benefits from stock-based compensation		157
Cash received from stock sale for employee stock purchase plan	55	345
Cash received from exercise of stock options	11	12
Repurchase of common stock	(753)
Net cash provided by (used in) financing activities	(687)	514
Net increase (decrease) in cash and cash equivalents	3,491	(759)
Cash and cash equivalents, beginning of period	7,475	17,856
Cash and cash equivalents, end of period	10,966	17,097
Supplemental disclosures of cash flow information:
Cash paid for income taxes	$ 100	$ 262