CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 310,039	$ 237,179
Accounts receivable	4,970	1,305
Inventory	925	419
Other current assets	8,277	6,043
Total current assets	324,211	244,946
Restricted cash	11,357	11,357
Property and equipment, net	152,499	108,777
Intangible and other assets, net	4,743	5,814
Total assets	492,810	370,894
Current liabilities:
Accounts payable	9,607	11,363
Current portion of long-term debt		4,200
Accrued compensation and benefits	12,688	12,778
Accrued product development expenses	14,213	16,740
Other accrued expenses	9,356	8,977
Current portion of deferred executive compensation		2,511
Current portion of deferred revenue	1,952	472
Other current liabilities	15,853	15,136
Total current liabilities	63,669	72,177
Convertible 3.625% senior notes, net	153,119
Other long-term debt		4,900
Long-term facility lease obligation	144,329	99,412
Other long-term liabilities	8,737	8,580
Deferred revenue	192	308
Stockholders' equity:
Preferred stock, $.01 par value; authorized 10,000,000 shares, none issued and outstanding	0	0
Common stock, $.001 par value; authorized, 450,000,000 shares in 2014 and 2013; issued and outstanding, 186,862,477 shares in 2014 and 185,896,080 shares in 2013	187	186
Additional paid-in capital	1,282,764	1,238,859
Accumulated other comprehensive loss	(1,451)	(1,535)
Accumulated deficit	(1,158,736)	(1,051,993)
Total stockholders' equity	122,764	185,517
Total liabilities and stockholders' equity	$ 492,810	$ 370,894