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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (64,670) $ (55,894)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and impairment charges 811 1,022
Stock-based compensation 5,610 4,913
Deferred executive compensation expense 332 633
Revaluation of warrant liability   15,924
Increase (decrease) from:    
Accounts receivable (5,514)  
Inventory (2,423)  
Vendor advances (2,649)  
Other current assets (2,010) (1,795)
Accounts payable 1,835 616
Accrued compensation and benefits (4,268) 2,649
Accrued product development expenses 2,337 (988)
Other accrued expenses 183 1,601
Other liabilities 345 712
Deferred revenue 3,220 (57)
Deferred executive compensation paid (1,589) 103
Net cash used in operating activities (68,450) (30,561)
Cash flows from investing activities:    
Acquisitions of marketable securities   (89,554)
Proceeds from maturities of marketable securities 20,000  
Change in restricted cash (6,133)  
Investment in property and equipment (1,147) (916)
Investment in intangible assets   (195)
Net cash provided by (used in) investing activities 12,720 (90,665)
Cash flows from financing activities:    
Repayment of long-term borrowings (525) (350)
Principal payments under capital lease obligation (12) (15)
Proceeds from issuance of common stock, net of issuance costs 310,037  
Proceeds from issuance of common stock pursuant to warrants   12,482
Payment of tax withholding obligations related to stock compensation (1,392) (2,302)
Proceeds from issuance of common stock pursuant to stock option and purchase plans 1,522 3,377
Net cash provided by financing activities 309,630 13,192
Effect of exchange rates on cash 22  
Net increase (decrease) in cash and cash equivalents 253,922 (108,034)
Cash and cash equivalents, beginning of period 119,379 306,256
Cash and cash equivalents, end of period 373,301 198,222
Supplemental non-cash investing and financing disclosure:    
Capitalization of construction-in-progress related to facility lease obligation 19,450  
Investment in property and equipment included in accounts payable or accruals $ 348 $ 758