CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 160,927	$ 230,888
Marketable securities	7,421	11,407
Accounts receivable, net	21,601	15,686
Inventory, net	936	1,096
Other current assets	18,343	16,120
Total current assets	209,228	275,197
Restricted cash	11,319	11,308
Property and equipment, net	275,762	254,082
Intangible and other assets, net	6,240	6,105
Total assets	502,549	546,692
Current liabilities:
Accounts payable	13,132	17,013
Current portion of long-term debt	16,636	13,872
Accrued compensation and benefits	14,255	25,331
Accrued product development expenses	21,016	22,132
Other accrued expenses	24,594	22,849
Current portion of deferred revenue	7,852	6,763
Other current liabilities	27,567	24,324
Total current liabilities	125,052	132,284
Long-term debt	445,519	429,220
Other long-term liabilities	11,047	11,244
Deferred revenue	74,943	77,085
Total liabilities	$ 656,561	$ 649,833
Commitments
Stockholders’ equity (deficit):
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; issued and outstanding 191,060,140 shares in 2016 and 189,662,148 shares in 2015	191	190
Additional paid-in capital	1,345,463	1,338,585
Accumulated other comprehensive (loss) income	(128)	3,835
Accumulated deficit	(1,499,538)	(1,445,751)
Total stockholders’ equity (deficit)	(154,012)	(103,141)
Total liabilities and stockholders’ equity (deficit)	$ 502,549	$ 546,692