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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 147 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Cash flows from operating activities:      
Net loss $ (2,389) $ (1,071) $ (77,322)
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 3 10 1,809
Non-cash interest expense     211
Share-based compensation 158 42 3,029
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 (251) (157) 2,699
Other assets (698) 20 6,642
Accounts payable (45) 312 (1,638)
Accrued expenses and other liabilities (465) 88 (19,005)
Deferred rent   (8) 1
Net cash used in operating activities (3,687) (764) (106,396)
Cash flows from investing activities:      
Cash received from merger     30,392
Payment of deferred transaction costs     (1,186)
Purchase of property and equipment   (9) (1,911)
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 (used in) provided by investing activities   (9) 45,022
Cash flows from 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     52,316
Proceeds from the issuance of common stock 9,018 1,741 24,868
Repayment of principal on bank note payable     (4,000)
Repayment of principal on convertible notes payables     (105)
Repayment of principal on vendor finance agreement (51) (43) (505)
Net cash provided by financing activities 8,133 1,390 82,576
Net increase in cash and cash equivalents 4,446 617 21,202
Cash and cash equivalents, beginning of period 16,756 2,920  
Cash and cash equivalents, end of period 21,202 3,537 21,202
Supplemental cash flow information:      
Interest paid 1 1 119
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 128 131 128
Preferred Stock
      
Cash flows from financing activities:      
Payment of offering costs     (2,329)
Common Stock
      
Cash flows from financing activities:      
Payment of offering costs $ (834) $ (308) $ (2,548)