CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 237,179	$ 119,379
Marketable securities		45,035
Accounts receivable	1,305
Inventory	419	6
Other current assets	6,043	3,930
Total current assets	244,946	168,350
Restricted cash	11,357	1,038
Property and equipment, net	108,777	7,681
Intangible and other assets, net	5,814	3,124
Total assets	370,894	180,193
Current liabilities:
Accounts payable	11,363	8,267
Current portion of long-term debt and capital lease obligations	4,200	2,115
Accrued compensation and benefits	12,778	11,865
Accrued product development expenses	16,740	14,061
Other accrued expenses	8,977	8,096
Current portion of deferred executive compensation	2,511	3,533
Current portion of deferred revenue	472	231
Other current liabilities	15,136	698
Total current liabilities	72,177	48,866
Long term debt	4,900	9,100
Long-term facility lease obligation	99,412
Other long-term liabilities	8,580	6,870
Deferred revenue	308	538
Deferred executive compensation		1,968
Commitments (Note 10)
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 2013 and 240,000,000 in 2012; shares issued and outstanding 185,896,080 shares in 2013 and 167,075,758 shares in 2012	186	167
Additional paid-in capital	1,238,859	890,499
Accumulated other comprehensive income (loss)	(1,535)	20
Accumulated deficit	(1,051,993)	(777,835)
Total stockholders' equity	185,517	112,851
Total liabilities and stockholders' equity	$ 370,894	$ 180,193