CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ (10,134,879)	$ (6,275,235)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	26,184	22,581
Retirement of fixed assets	2,187	2,186
Stock option and warrant expense	321,614	348,328
Fair value adjustment on warrant liability	3,888,166	(600,473)
Changes in assets and liabilities:
Receivable	172,325	99,270
Interest receivable	29,720	49,495
Prepaid expenses and other current assets	211,020	(578,758)
Income taxes recoverable	0	97,996
Accounts payable	534,804	1,398,809
Accrued expenses and other current liabilities	916,530	1,692,156
Net cash used in operating activities	(4,032,329)	(3,743,645)
Cash flows from investing activities:
Net proceeds from sale of marketable securities	2,989,902	1,491,241
Proceeds from sale of assets held for sale	0	0
Proceeds from sale of unconsolidated subsidiary shares	0	6,938,603
Purchases of equipment and furnishings	(29,467)	(8,214)
Net cash provided by investing activities	2,960,435	8,421,630
Net increase (decrease) in cash	(1,071,894)	4,677,985
Cash at beginning of period	17,988,590	6,324,430
Cash at end of period	16,916,696	11,002,415
Supplemental disclosure of cash flow information:
Cash received during the period as interest income	$ 65,178	$ 42,227