v2.4.0.6
Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities      
Net loss $ (115,344) $ (83,862) $ (85,302)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 7,583 6,336 5,541
Stock-based compensation 24,916 19,009 20,000
Loss on sale of equipment   33  
Forgiveness of notes receivable 16 8 (13)
Changes in operating assets and liabilities:      
Receivables (29) 81 14
Prepaid and other assets 2,288 649 2,741
Accounts payable 3,312 (236) (1,625)
Accrued personnel related expenses, accrued interest on convertible subordinated notes and accrued liabilities 5,124 3,321 (3,689)
Deferred rent 2,429 1,446 (709)
Deferred revenue (18,633) (21,801) 4,589
Other long-term liabilities   (128) 389
Net cash used in operating activities (88,338) (75,144) (58,064)
Cash flows from investing activities      
Purchases of property and equipment (3,628) (861) (744)
Purchases of marketable securities (301,563) (183,899) (123,460)
Maturities of marketable securities 231,476 131,855 118,065
Sales of marketable securities 17,321 12,024 5,000
Sale of equipment   12  
Release of restricted cash   417 2,500
Additions to notes receivable (140)    
Decrease in notes receivable 715 140 375
Net cash (used in) provided by investing activities (55,819) (40,312) 1,736
Cash flows from financing activities      
Payments on notes payable and capital leases (206) (184) (131)
Net proceeds from issuances of common stock 25,808 231,429 11,723
Net cash provided by financing activities 25,602 231,245 11,592
Net increase (decrease) in cash and cash equivalents (118,555) 115,789 (44,736)
Cash and cash equivalents at beginning of period 163,333 47,544 92,280
Cash and cash equivalents at end of period 44,778 163,333 47,544
Supplemental Disclosure of Cash Flow Information      
Cash paid for interest 5,195 5,217 5,229
Supplemental Disclosure of Non-Cash Investing Activity      
Acquisition cost of property and equipment under capital lease     $ 154