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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 265 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (40,965) $ (38,173) $ (2,145,877)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and accretion 3,348 3,696 130,125
Stock-based compensation expense 5,189 2,878 143,107
Stock expense for shares issued pursuant to research agreement     3,018
(Gain) loss on sale, abandonment/disposal or impairment of property and equipment   (32) 24,253
Accrued interest on investments, net of amortization of discounts     (191)
In-process research and development     19,726
Goodwill impairment     151,428
Loss on available-for-sale securities   117 990
Litigation Settlement in stock     6,494
Fair value of forward purchase contract   (1,705) 1,237
Other, net (2) 285 1,097
Changes in assets and liabilities:      
State research and development credit exchange receivable (78) (92) (841)
Prepaid expenses and other current assets 690 365 (1,880)
Other assets     (230)
Accounts payable (924) (1,713) 3,494
Accrued expenses and other current liabilities 715 1,888 35,764
Other liabilities     (2)
Net cash used in operating activities (32,027) (32,486) (1,628,288)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of marketable securities     (796,779)
Sales and maturities of marketable securities     796,393
Purchase of property and equipment (1,459) (323) (329,205)
Proceeds from sale of property and equipment   32 454
Net cash used in investing activities (1,459) (291) (329,137)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Issuance of common stock and warrants, net of issuance costs 78 80,598 1,397,834
Collection of Series C convertible preferred stock subscriptions receivable     50,000
Issuance of Series B convertible preferred stock for cash     15,000
Cash received for common stock to be issued     3,900
Repurchase of common stock     (1,028)
Put shares sold to majority stockholder     623
Borrowings under lines of credit     4,220
Proceeds from notes receivables     1,742
Borrowings on notes payable to related party   6,250 387,750
Principal payments on notes payable to related party     (70,000)
Borrowings on notes payable     3,460
Principal payments on notes payable     (1,667)
Proceeds from senior convertible notes     207,050
Payment of employment taxes related to vested restricted stock units (427) (397) (13,454)
Net cash provided by (used in) financing activities (349) 86,451 1,985,430
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (33,835) 53,674 28,005
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 61,840 2,681  
CASH AND CASH EQUIVALENTS, END OF PERIOD 28,005 56,355 28,005
SUPPLEMENTAL CASH FLOWS DISCLOSURES:      
Cash paid for income taxes     26
Interest paid in cash, net of amounts capitalized 2,863 2,595 62,015
Accretion on redeemable convertible preferred stock     (952)
Issuance of common stock upon conversion of notes payable     3,331
Increase in additional paid-in capital resulting from merger     171,154
Issuance of common stock for notes receivable     2,758
Issuance of put option by stockholder     (2,949)
Put option redemption by stockholder     1,921
Issuance of Series C convertible preferred stock subscriptions     50,000
Issuance of Series A redeemable convertible preferred stock     4,296
Conversion of Series A redeemable convertible preferred stock     (5,248)
Non-cash construction in progress and property and equipment 3,863 921 3,863
Capitalization of interest on note payable to related party     14,219
Cancellation of principal on note payable to related party     212,334
Forward purchase contract contribution to APIC     29,317
Reclassification of forward purchase contract to APIC     $ 28,080