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Consolidated Statements Of Cash Flows (USD $)
In Thousands
 6 Months Ended 116 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Cash flows used in operating activities:      
Net loss $ (1,912) $ (4,719) $ (60,222)
Adjustments to reconcile net loss to net cash used in operating activities:      
Gain on bargain purchase     (25,282)
Gain on patent rights assignment (2,000)   (2,000)
Depreciation and amortization 195 171 1,330
Non-cash interest expense     211
Share-based compensation 153 224 2,127
Issuance of warrants for lease termination     377
Accretion of liabilities     152
Impairment of property and equipment     125
Impairment of in-process research and development     6,000
Write-off of deferred tax liability     (2,281)
Gain on marketable securities available for sale     (263)
(Gain) loss from disposal of property and equipment 5 (4) 72
Other, net     267
Change in operating assets and liabilities (net of amounts acquired):      
Other current assets (81) (12) 2,447
Other assets 40   7,206
Accounts payable 129 (254) (1,673)
Accrued expenses and other liabilities (325) (521) (19,089)
Deferred rent (251) (55) 65
Net cash used in operating activities (4,047) (5,170) (90,431)
Cash flows (used in) provided by investing activities:      
Cash received from Merger     30,392
Payment of deferred transaction costs     (1,186)
Purchase of property and equipment (1) (2) (1,861)
Proceeds from sale of marketable securities     15,369
Proceeds from sale of property and equipment 1 6 334
Proceeds from assignment of patent rights 2,000   2,000
Net cash (used in) provided by investing activities 2,000 4 45,048
Cash flows (used in) provided by financing activities:      
Proceeds from issuance of convertible notes payable and related warrants for common stock     10,841
Proceeds from issuance of bank note payable     4,000
Proceeds from stock subject to repurchase     38
Proceeds from the issuance of preferred stock     32,316
Proceeds from the issuance of common stock 3,000 7,658 10,855
Repayment of principal on bank note payable     (4,000)
Repayment of principal on convertible notes payables     (105)
Repayment of principal on vendor finance agreement (48)   (48)
Net cash (used in) provided by financing activities 2,485 7,320 52,846
Net (decrease) increase in cash and cash equivalents 438 2,154 7,463
Cash and cash equivalents, beginning of period 7,025 7,763  
Cash and cash equivalents, end of period 7,463 9,917 7,463
Supplemental cash flow information:      
Interest paid 2 4 109
Supplemental disclosure of noncash investing and financing transactions:      
Accrued interest on notes payable converted to equity     163
Warrant issued in connection with credit facility     111
Accrued deferred transaction costs 482   482
Vendor finance agreement 147   147
Common Stock [Member]
      
Cash flows (used in) provided by financing activities:      
Payment of offering costs (467) (338) (805)
Preferred Stock [Member]
      
Cash flows (used in) provided by financing activities:      
Payment of offering costs     $ (246)