Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 48,928	$ 5,976
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	7,976	7,572
Depreciation and amortization	5,385	4,419
Amortization of purchased intangibles	10,895	0
Amortization of debt discount and issuance costs	5,779	0
Contingent consideration	2,258	0
Release of valuation allowance for deferred tax assets	(92,358)	0
Changes in operating assets and liabilities, net of acquisition:
Decrease in accounts receivable, trade and other	6,128	1,699
Increase in inventories	(3,981)	(5,131)
Decrease in prepaid expenses and other assets	6,185	722
Increase (decrease) in accounts payable and accrued expenses	6,182	(429)
Increase (decrease) in deferred revenue	(10,819)	5,905
Increase (decrease) in deferred rent	3,355	(566)
Net cash provided by (used in) operating activities	(4,087)	20,167
Cash flows from investing activities:
Business acquisition, net of cash acquired	(588,917)	0
Purchases of short-term investments	(65,537)	(117,223)
Redemptions of short-term investments	142,385	85,789
Purchases of property and equipment	(9,223)	(2,382)
Sales and redemptions of long-term investments	1,600	100
Net cash used in investing activities	(519,692)	(33,716)
Cash flows from financing activities:
Proceeds from issuance of term loan, net of issuance costs	214,035	0
Repayment of term loan	(2,812)	0
Proceeds from issuance of convertible debt, net of issuance costs	338,921	0
Payments of contingent consideration	(3,724)	0
Purchase of convertible note hedge	(70,000)	0
Proceeds from sale of warrants	41,475	0
Proceeds from exercise of common stock options	65	7,492
Employee Stock Purchase Plan purchases	0	1,720
Treasury stock acquisition	(139)	(77)
Payments from Board of Director stock purchases	32	68
Net cash provided by financing activities	517,853	9,203
Effect of exchange rate changes on cash	(51)	11
Decrease in cash and cash equivalents	(5,977)	(4,335)
Cash and cash equivalents, beginning of period	35,857	37,535
Cash and cash equivalents, end of period	29,880	33,200
Supplemental data:
Fair value of assets acquired, net of cash acquired	840,909	0
Purchase consideration representing compensation	8,309	0
Fair value of liabilities assumed and contingent consideration	(248,301)	0
Fair value of warrants issued	(12,000)	0
Net cash paid for acquisition	588,917	0
Interest paid	$ 2,161	$ 0