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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income (loss) $ (10,937) $ 8,779 $ (4,335)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Amortization of intangibles 29,204 30,420 17,425
Depreciation 15,195 13,867 9,990
Stock-based compensation 18,926 20,913 15,539
Net (gain) loss on disposal of fixed assets (36) 671 162
Deferred income taxes (4,969) (361) (1,461)
Provision for doubtful accounts and sales returns 3,602 3,235 2,589
Provision for excess and obsolete inventories 3,377 3,936 4,153
Excess tax benefits from stock-based compensation (121) (1,955) (271)
Other non-cash adjustments, net 1,006 801 1,529
Changes in assets and liabilities, net of effect of acquisitions:      
Accounts receivable 20,368 (11,477) (22,333)
Inventories 3,003 (16,588) (16,132)
Prepaid expenses and other assets (2,684) 7,924 (5,445)
Accounts payable (5,201) 4,750 (3,080)
Deferred revenue 1,334 (13,470) 5,086
Income taxes payable 1,535 (6,843) 11,017
Accrued excess facility costs (1,724) (327) (2,412)
Accrued and other liabilities (1,065) 902 5,545
Net cash provided by operating activities 70,813 45,177 17,566
Cash flows from investing activities:      
Purchases of investments (133,778) (107,544) (51,457)
Proceeds from maturities of investments 57,484 28,733 80,961
Proceeds from sales of investments 41,354 30,999 63,269
Acquisition of property and equipment (12,609) (17,269) (35,624)
Acquisition of Omneon, net of cash received     (153,254)
Other acquisitions   (250) (250)
Net cash used in investing activities (47,549) (65,331) (96,355)
Cash flows from financing activities:      
Proceeds from lease financing liability     18,833
Proceeds from issuance of common stock, net 4,819 12,701 3,859
Repurchase of common stock (22,639)    
Excess tax benefits from stock-based compensation 121 1,955 271
Net cash provided by (used in) financing activities (17,699) 14,656 22,963
Effect of exchange rate changes on cash and cash equivalents 122 (52) (118)
Net increase (decrease) in cash and cash equivalents 5,687 (5,550) (55,944)
Cash and cash equivalents at beginning of period 90,983 96,533 152,477
Cash and cash equivalents at end of period 96,670 90,983 96,533
Supplemental disclosures of cash flow information:      
Income tax payments, net 5,051 7,597 1,427
Acquisition of Omneon [Member]
      
Non-cash investing and financing activities:      
Issuance of restricted common stock for Omneon acquisition     95,938
Fair value of vested portion of stock options and restricted stock units assumed in connection with the Omneon acquisition     $ 2,125