Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	164 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (14,889)	$ (1,848)	$ (160,330)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock option compensation expense	703	1,188	15,086
Restricted stock and warrant compensation expense	230	105	4,439
Depreciation expense	322	216	1,888
Amortization of organization costs and loss on disposal of equipment	0	0	52
Warrant liability fair value adjustment	338	(5,966)	5,471
Non-cash interest income	(3)	0	(14)
Changes in assets and liabilities:
Decrease (increase) in prepaid expenses and other current assets	(111)	490	(1,339)
Decrease in investment in common stock	0	0	46
Increase (decrease) in accounts payable and accrued expenses	(772)	(908)	5,627
Deferred revenue	0	0	300
Net cash used in operating activities	(14,182)	(6,723)	(128,774)
Cash flows from investing activities:
Purchase of equipment, furniture and fixtures	(572)	(1,249)	(5,402)
Purchase of short-term investments and marketable equity securities	(1,743)	0	(51,415)
Proceeds from maturities of short-term investments	2,988	1,492	47,642
Organization costs	0	0	(42)
Net cash (used in) provided by investing activities	673	243	(9,217)
Cash flows from financing activities:
Net proceeds from sale of stock and exercise of stock options and warrants	4,782	144	153,887
Repurchases of common stock	0	0	(51)
Dividends paid on preferred stock	0	0	(500)
Proceeds from short-term borrowings	0	0	1,705
Net cash provided by financing activities	4,782	144	155,041
(Decrease) increase in cash and cash equivalents	(8,727)	(6,336)	17,050
Cash and cash equivalents at beginning of period	25,777	45,621	0
Cash and cash equivalents at end of period	17,050	39,285	17,050
Supplemental cash flow information:
Cash paid for interest	0	0	171
Supplemental non-cash activities:
Cashless exercise of stock options and shares surrendered upon restricted stock vesting	0	184	1,245
Fair value of warrants issued	153	0	6,612
Fair value of warrants reclassified from liability to additional paid-in capital upon exercise	$ 0	$ 9,154	$ 9,154

The amount of recurring noncash expense charge against earnings in the period that reflects the allocation of capitalized costs associated with the organization of the company and the gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations.

No definition available.