Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended		103 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Cash flows from operating activities:
Net loss	$ (5,227)	$ (6,027)	$ (71,011)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	84	85	585
Loss on disposal of equipment	7		19
Non-cash rent expense			29
Accretion and receipt of bond discount			35
Non-cash share-based compensation	1,810	2,625	17,667
Loss on exchange of equity instruments	900		900
Fair value of shares mandatorily redeemable for cash upon exercise of warrants			(785)
Fair value of common stock warrants issued in exchange for services	87	500	2,381
Fair value of common stock issued in exchange for services	23		304
Change in fair value of common stock warrants issued in connection with various equity financings	(5,393)	(3,181)	(7,584)
Fair value of common stock issued in exchange for licensing rights			3,954
Change in fair value of contingent purchase consideration	(28)		(28)
Changes in assets and liabilities:
Prepaid expenses	(94)	(190)	(244)
Accounts payable	(590)	(296)	134
Due to former parent			(207)
Deferred revenue	578		578
Accrued expenses and other current liabilities	757	333	2,077
Net cash used in operating activities	(7,086)	(6,151)	(51,196)
Cash flows from investing activities:
Cash received in acquisition	168		168
Purchase of short-term investments		(5,996)	(37,532)
Maturities of short-term investments			37,497
Cash paid for purchase of equipment and furnishings	(53)	(54)	(739)
Disposal of equipment and furnishings			(1)
Cash refunded (paid) for lease deposit			(45)
Net cash provided by (used in) investing activities	115	(6,050)	(652)
Cash flows from financing activities:
Net proceeds from issuance of common stock	18,060	15,235	64,427
Cash paid for repurchase of common stock		(3,849)	(3,849)
Net proceeds from exercise of common stock options		255	610
Repayments of capital lease obligations	(47)	(31)	(173)
Cash advances from former parent company, net			8,766
Net cash provided by financing activities	18,013	11,610	69,781
Net increase (decrease) in cash and cash equivalents	11,042	(591)	17,933
Cash and cash equivalents at the beginning of period	6,891	5,684
Cash and cash equivalents at end of period	17,933	5,093	17,933
Supplemental disclosure of cash flow information:
Cash received during the period for interest		2	724
Cash paid during the period for interest	4		11
Supplemental disclosure of non-cash investing and financing activities:
Settlement of corporate formation expenses in exchange for common stock			978
Fair value of warrants issued in connection with common stock recorded as a cost of equity	13,232	2,466	18,561
Fair value of shares mandatorily redeemable for cash upon the exercise of warrants		785	785
Fair value of stock options modified	674		674
Allocation of management expenses			551
Equipment and furnishings exchanged for common stock			48
Equipment and furnishings acquired through capital lease	44	28	241
Value of restricted stock units and common stock issued in lieu of cash bonuses		207	207
Value of restricted stock units and common stock issued in lieu of bonuses included in accrued expenses	427	47	474
Non-cash lease deposit			50
Apthera Acquisition:
Fair value of shares issued to acquire Apthera	6,367		6,367
Fair value of contingent purchase price consideration in connection with Apthera acquisition	6,460		6,460
Net assets acquired excluding cash of $168	$ 12,827		$ 12,827