Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ (55,820)	$ (10,631)
Adjustments to reconcile net loss to net cash provided by (used in) operations:
Depreciation	3,635	3,130
Amortization of intangible assets	2,858	218
Stock-based compensation expense	7,249	4,636
Deferred income taxes	4,169	5,489
Realized gain on sale of short-term investments, net	(90)	(425)
Changes in assets and liabilities:
Accounts receivable	815	(7,255)
Inventories	6,585	(9,037)
Prepaid expenses and other current assets and other assets	4,600	(1,930)
Accounts payable	6,660	10,934
Accrued expenses, other current liabilities and other long-term liabilities	(1,707)	5,518
Net cash provided by (used in) operating activities	(21,046)	647
Cash flows from investing activities:
Purchases of property and equipment	(2,495)	(2,867)
Purchases of investments	(65,140)	(109,264)
Sales and maturities of investments	62,503	113,242
Net cash provided by (used in) investing activities	(5,132)	1,111
Cash flows from financing activities:
Repurchase of common stock		(20,058)
Proceeds from issuance of common stock	4,374	3,335
Net cash provided by (used in) financing activities	4,374	(16,723)
Net decrease in cash and cash equivalents	(21,804)	(14,965)
Cash and cash equivalents at beginning of period	81,107	89,318
Cash and cash equivalents at end of period	59,303	74,353
Supplemental cash flow information:
Cash payment for income taxes	711	627
Non-cash investing activities:
Purchase of property and equipment included in accrued liabilities		$ 114