Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Cash flows from operating activities
Net income (loss)	$ (13,924)		$ 1,840
Adjustments to reconcile income (loss) to net cash used in operating activities:
Stock-based compensation expense	568		255
Depreciation and amortization	8		23
Amortization of debt discount and debt issuance costs	66		0
Change in fair value of warrant liability	4,879		(3,615)
Foreign exchange gain on marketable securities	(38)		(144)
Other non-cash items	0		(46)
Changes in operating assets and liabilities:
Accounts receivable	0		(4,000)
Prepaids and other assets	(302)		(309)
Accounts payable	211		200
Accrued clinical expense	194		25
Accrued compensation	(694)		(520)
Other accrued liabilities	(266)		(424)
Net cash used in operating activities	(9,298)		(6,715)
Cash flows from investing activities
Purchases of property and equipment	0		(12)
Purchases of marketable securities	(8,691)		(16,529)
Proceeds from maturities of marketable securities	13,928		16,856
Net cash provided by investing activities	5,237		315
Cash flows from financing activities
Proceeds from issuance of common stock through controlled equity offering facilities, net	0		2,091
Proceeds from exercise of stock options and employee stock purchase plans	32		0
Net cash provided by financing activities	32		2,091
Net decrease in cash and cash equivalents	(4,029)		(4,309)
Cash and cash equivalents at beginning of period	9,311	[1]	14,223
Cash and cash equivalents at end of period	$ 5,282		$ 9,914

[1] The condensed consolidated balance sheet as of December 31, 2011 has been derived from the audited financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2011.