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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating activities      
Net loss $ (52,550) $ (18,553) $ (22,441)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Amortization of premiums relating to available-for-sale securities 244 967  
Depreciation and amortization 7,954 5,015 4,942
Loss on retirement of property and equipment 2,449 77   
Amortization of intangible assets 18,121 6,180 6,180
Revaluation of warrant liability   173 (37)
Stock-based compensation 21,603 25,575 9,196
Net gains on investments   (37)  
Changes in operating assets and liabilities:      
Change in restricted cash 300 629 4,227
Accounts receivable, net 12,287 3,615 (14,209)
Inventory 9,182 (6,001) 4,841
Deferred cost of revenue (553) 8,697 (2,260)
Prepaids and other assets (148) 1,237 (4,252)
Accounts payable (7,818) (4,367) (3,855)
Accrued liabilities (386) (2,642) 12,138
Deferred revenue 4,217 (11,430) 7,664
Other long-term liabilities (313) 41 (744)
Net cash provided by operating activities 14,589 9,176 1,390
Investing activities      
Purchase of property and equipment (7,355) (5,614) (5,064)
Acquisition of Occam Networks, net of cash assumed (60,809)      
Purchase of marketable securities   (79,190) (36,245)
Sales of marketable securities   29,214  
Maturities of marketable securities 31,755 53,302  
Net cash used in investing activities (36,409) (2,288) (41,309)
Financing activities      
Proceeds from exercise of stock options and warrants and other 804 288 60
Proceeds from loans     20,000
Proceeds from employee stock purchase plan 3,938    
Taxes withheld upon vesting of restricted stock units (10,376) (10,004)  
Principal payments on loans   (20,000) (21,000)
Proceeds from issuance of Series J preferred stock     49,478
Repurchase of common and preferred stock     (12)
Proceeds from initial public offering of common stock, net of issuance costs   57,311  
Net cash (used in) provided by financing activities (5,634) 27,595 48,526
Effect of exchange rate changes on cash and cash equivalents 88      
Net (decrease) increase in cash and cash equivalents (27,366) 34,483 8,607
Cash and cash equivalents at beginning of year 66,304 31,821 23,214
Cash and cash equivalents at end of year 38,938 66,304 31,821
Supplemental Schedule of noncash investing and financing activity      
Value of common stock issued in acquisition 117,258    
Fair value of equity awards assumed 1,370    
Interest paid 87 796 4,384
Income taxes paid 79 40 39
Series I Preferred Stock [Member]
      
Supplemental Schedule of noncash investing and financing activity      
Issuance of Series I preferred stock dividends   $ 900 $ 3,747