CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 352,688	$ 237,179
Accounts receivable	8,397	1,305
Inventory, net	979	419
Other current assets	23,578	6,043
Total current assets	385,642	244,946
Restricted cash	11,308	11,357
Property and equipment, net	203,027	108,777
Intangible and other assets, net	3,893	5,814
Total assets	603,870	370,894
Current liabilities:
Accounts payable	10,819	11,363
Current portion of long-term debt		4,200
Current portion of long-term facility lease obligation	6,707
Accrued compensation and benefits	21,095	12,778
Accrued product development expenses	13,958	16,740
Other accrued expenses	11,514	8,977
Current portion of deferred executive compensation		2,511
Current portion of deferred revenue	8,075	472
Other current liabilities	17,830	15,136
Total current liabilities	89,998	72,177
Long-term debt	156,908	4,900
Long-term facility lease obligation	189,320	99,412
Other long-term liabilities	11,338	8,580
Deferred revenue	75,505	308
Commitments (Note 9)
Stockholders' equity:
Preferred stock, $.01 par value, authorized 10,000,000 shares, none issued and outstanding
Common stock, $.001 par value, authorized 450,000,000 shares in 2014 and in 2013; shares issued and outstanding 187,294,094 in 2014 and 185,896,080 shares in 2013	187	186
Additional paid-in capital	1,299,394	1,238,859
Accumulated other comprehensive loss	(4,185)	(1,535)
Accumulated deficit	(1,214,595)	(1,051,993)
Total stockholders' equity	80,801	185,517
Total liabilities and stockholders' equity	$ 603,870	$ 370,894