Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 24,770	$ 66,061
Marketable securities	497	4,370
State research and development credit exchange receivable - current	0	674
Prepaid expenses and other current assets	1,593	2,849
Total current assets	26,860	73,954
Property and equipment - net	200,383	202,356
State research and development credit exchange receivable - net of current portion	885	629
Other assets	230	317
Total	228,358	277,256
Current liabilities:
Accounts payable	1,600	3,294
Accrued expenses and other current liabilities	19,958	14,840
Total current liabilities	21,558	18,134
Senior convertible notes	209,979	209,335
Note payable to related party	242,203	235,319
Total liabilities	473,740	462,788
Commitments and contingencies
Stockholders' deficit:
Undesignated preferred stock, $0.01 par value - 10,000,000 shares authorized; no shares issued or outstanding at June 30, 2011 and December 31, 2010	0	0
Common stock, $0.01 par value - 250,000,000 and 200,000,000 shares authorized at June 30, 2011 and December 31, 2010, respectively; 130,905,582 and 127,793,178 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	1,309	1,278
Additional paid-in capital	1,614,018	1,587,858
Accumulated other comprehensive income	38	74
Deficit accumulated during the development stage	(1,860,747)	(1,774,742)
Total stockholders' deficit	(245,382)	(185,532)
Total	$ 228,358	$ 277,256