CONDENSED 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 loss	$ (133,655)	$ (107,206)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization and impairment charges	1,769	6,660
Stock-based compensation	19,928	8,444
Deferred executive compensation expense	683	1,482
Revaluation of warrant liability		15,924
Increase (decrease) from:
Accounts receivable	(4,888)
Inventory	(710)
Vendor advances	(3,636)
Other current assets	(3,057)	(1,531)
Other assets	(2,293)	(17)
Accounts payable	2,016	4,448
Accrued compensation and benefits	1,849	3,540
Accrued product development expenses	2,996	(1,947)
Other accrued expenses	3,481	1,589
Other liabilities	2,049	1,635
Deferred revenue	3,277	(115)
Deferred executive compensation paid	(3,953)	(1,063)
Net cash used in operating activities	(114,144)	(68,157)
Cash flows from investing activities:
Acquisitions of marketable securities		(89,554)
Proceeds from maturities of marketable securities	25,000
Change in restricted cash	(6,133)	(200)
Investment in property and equipment	(1,749)	(1,966)
Investment in intangible assets		(465)
Net cash provided by (used in) investing activities	17,118	(92,185)
Cash flows from financing activities:
Repayment of long-term borrowings	(1,050)	(700)
Principal payments under capital lease obligation	(15)	(29)
Proceeds from issuance of common stock, net of issuance costs	310,037
Proceeds from issuance of common stock pursuant to warrants		12,482
Proceeds from issuance of common stock pursuant to stock option and purchase plans	2,344	5,681
Payment of tax withholding obligations related to stock compensation	(1,753)	(2,615)
Net cash provided by financing activities	309,563	14,819
Effect of exchange rates on cash	(25)
Net increase (decrease) in cash and cash equivalents	212,512	(145,523)
Cash and cash equivalents, beginning of period	119,379	306,256
Cash and cash equivalents, end of period	331,891	160,733
Supplemental non-cash investing and financing disclosure:
Capitalization of construction-in-progress related to facility lease obligation	46,549
Investment in property and equipment included in accounts payable or accruals	$ 1,478	$ 430