Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 373,301	$ 119,379
Marketable securities	25,027	45,035
Accounts receivable	5,514
Inventory	2,430	6
Vendor advances	3,154	505
Other current assets	5,570	3,425
Total current assets	414,996	168,350
Restricted cash	7,171	1,038
Property and equipment, net	27,209	7,681
Other assets, net	2,984	3,124
Total assets	452,360	180,193
Current liabilities:
Accounts payable	10,251	8,267
Current portion of long-term debt	2,625	2,100
Accrued compensation and benefits	7,597	11,865
Accrued product development expenses	16,398	14,061
Other accrued expenses	7,899	8,096
Current portion of deferred executive compensation	3,688	3,533
Current portion of deferred revenue	3,508	231
Other current liabilities	1,325	713
Total current liabilities	53,291	48,866
Long-term debt	8,050	9,100
Long-term facility lease obligation	19,450
Other long-term liabilities	6,557	6,870
Deferred executive compensation	556	1,968
Deferred revenue	480	538
Stockholders' equity:
Preferred stock, $.01 par value; authorized 10,000,000 shares, none issued and outstanding
Common stock, $.001 par value; authorized, 240,000,000 shares in 2013 and 2012; issued and outstanding, 184,552,174 shares in 2013 and 167,075,758 shares in 2012	185	167
Additional paid-in capital	1,206,258	890,499
Accumulated other comprehensive income	38	20
Accumulated deficit	(842,505)	(777,835)
Total stockholders' equity	363,976	112,851
Total liabilities and stockholders' equity	$ 452,360	$ 180,193