CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 230,888	$ 352,688
Marketable securities	11,407
Accounts receivable	15,686	8,397
Inventory, net	1,096	979
Other current assets	16,120	23,578
Total current assets	275,197	385,642
Restricted cash	11,308	11,308
Property and equipment, net	254,082	203,027
Intangible and other assets, net	6,105	3,139
Total assets	546,692	603,116
Current liabilities:
Accounts payable	17,013	10,819
Current portion of long-term debt	13,872	6,707
Accrued compensation and benefits	25,331	21,095
Accrued product development expenses	22,132	13,958
Other accrued expenses	22,849	11,514
Current portion of deferred revenue	6,763	8,075
Other current liabilities	24,324	17,830
Total current liabilities	132,284	89,998
Long-term debt (Note 7)	429,220	345,474
Other long-term liabilities	11,244	11,338
Deferred revenue	77,085	75,505
Total liabilities	$ 649,833	$ 522,315
Commitments (Note 8)
Stockholders' equity (deficit):
Preferred stock, $.01 par value, authorized 10,000,000 shares, none issued and outstanding
Common stock, $.001 par value, authorized 450,000,000 shares; issued and outstanding 189,662,148 shares in 2015 and 187,294,094 shares in 2014	$ 190	$ 187
Additional paid-in capital	1,338,585	1,299,394
Accumulated other comprehensive income (loss)	3,835	(4,185)
Accumulated deficit	(1,445,751)	(1,214,595)
Total stockholders' equity (deficit)	(103,141)	80,801
Total liabilities and stockholders' equity (deficit)	$ 546,692	$ 603,116