Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities
Net (loss) income	$ (59,664)	$ (6,434)	$ 118,350
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	343	54	707
Stock based compensation expense	1,599	366	2,542
Gain on sale of asset, net	(1)	0	(127,474)
Impairment Loss	25,990	0	0
Changes in operating assets and liabilities:
Accounts receivable	(286)	19	(123)
Income tax receivable	0	2,023	(2,023)
Prepaid expenses and other assets	(214)	(78)	0
Accounts payable	884	(2,750)	(85)
Accrued expenses	667	(1,126)	(874)
Accrued lease expenses	1,201	0	0
Accrued compensation	(322)	201	214
Deferred revenue	(402)	4	96
Restricted stock unit liability	0	0	(113)
Asset retirement obligation	0	0	(2,217)
Interest payable	0	(1)	(12)
Net cash (used in) provided by operating activities	(30,205)	(7,722)	(11,012)
Investing activities
Cash consideration for merger, net of cash acquired	0	(6,733)	0
Cash received from asset sale	0	0	127,474
Purchase of fixed assets	(979)	0	0
Sales of short-term investments	36,500	115,153	0
Purchases of short-term investments	(1,161)	(102,462)	(108,744)
Net cash provided by (used in) investing activities	34,360	5,958	18,730
Financing activities
Payments on capital lease obligations	(82)	(6)	0
Repayment of convertible notes	0	(231)	(1,246)
Proceeds from issuance of common stock	32	0	580
Warrants converted into shares	0	0	3,491
Other	0	4	52
Net cash (used in) provided by financing activities	(50)	(233)	2,877
Increase (decrease) in cash and cash equivalents	4,105	(1,997)	10,595
Cash and cash equivalents at beginning of period	10,743	12,740	2,145
Cash and cash equivalents at end of period	14,848	10,743	12,740
Supplemental disclosures of cash flow information
Cash paid for interest	10	0	82
Cash paid (received) for taxes, net	0	(1,884)	2,795
Supplemental disclosures of non-cash investing and financing activities
Purchase of capital leases	198	0	0
Unrealized (loss) gain on investments	(543)	548	445
Accretion of beneficial conversion charge	$ (9,175)	$ 0	$ 0