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Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 135 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Cash flows used in operating activities:      
Net loss $ (1,071) $ (1,407) $ (69,065)
Adjustments to reconcile net loss to net cash used in operating activities:      
Gain on patent rights assignment     (2,000)
Gain on bargain purchase     (25,282)
Depreciation and amortization 10 14 1,790
Non-cash interest expense     211
Share-based compensation 42 91 2,630
Issuance of warrants for lease termination     377
Accretion of liabilities     152
Impairment of property and equipment     125
Loss on 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     83
Other, net     267
Change in operating assets and liabilities (net of amounts acquired):      
Other current assets (157) (72) 2,663
Other assets 20 20 7,346
Accounts payable 312 (134) (1,813)
Accrued expenses and other liabilities 88 (160) (19,133)
Deferred rent (8) (8) 8
Net cash used in operating activities (764) (1,656) (98,185)
Cash flows provided by (used in) investing activities:      
Cash received from Merger     30,392
Payment of deferred transaction costs     (1,186)
Purchase of property and equipment (9)   (1,888)
Proceeds from sale of marketable securities     15,369
Proceeds from sale of property and equipment     358
Proceeds from patent rights assignment     2,000
Net cash provided by (used in) investing activities (9)   45,045
Cash flows provided by (used in) 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
Payment of offering costs   (60) (60)
Proceeds from the issuance of common stock 1,741   15,850
Repayment of principal on bank note payable     (4,000)
Repayment of principal on convertible notes payables     (105)
Repayment of principal on vendor finance agreement (43)   (323)
Net cash provided by (used in) financing activities 1,390 (60) 56,677
Net (decrease) increase in cash and cash equivalents 617 (1,716) 3,537
Cash and cash equivalents, beginning of period 2,920 5,943  
Cash and cash equivalents, end of period 3,537 4,227 3,537
Supplemental cash flow information:      
Interest paid 1   116
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
Vendor finance agreement 131 134 131
Preferred Stock
      
Cash flows provided by (used in) financing activities:      
Payment of offering costs     (246)
Common Stock
      
Cash flows provided by (used in) financing activities:      
Payment of offering costs $ (308)   $ (1,634)