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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 272 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (137,907) $ (117,585) $ (2,242,819)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and accretion 10,109 10,929 136,886
Stock-based compensation expense 31,304 9,770 169,222
Stock expense for shares issued pursuant to research agreement     3,018
(Gain) loss on sale, abandonment/disposal or impairment of property and equipment 686 (73) 24,939
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   (12,011) 1,237
Other, net (3) (4) 1,096
Changes in assets and liabilities:      
State research and development credit exchange receivable 242 (270) (521)
Prepaid expenses and other current assets (708) (18,007) (3,278)
Other assets     (230)
Accounts payable (1,929) (1,526) 2,489
Accrued expenses and other current liabilities 3,525 36,898 38,574
Other liabilities     (2)
Net cash used in operating activities (94,681) (91,762) (1,690,942)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of marketable securities     (796,779)
Sales and maturities of marketable securities     796,393
Purchase of property and equipment (1,821) (572) (329,567)
Proceeds from sale of property and equipment   73 454
Net cash used in investing activities (1,821) (499) (329,499)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Issuance of common stock and warrants, net of issuance costs 2,488 80,982 1,400,244
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
Exercise of warrants for common stock 49,170   49,170
Borrowings under lines of credit     4,220
Proceeds from notes receivables     1,742
Proceeds from issuance of facility financing obligation & milestone rights 79,500   79,500
Facility financing obligation & milestone rights issuance costs (598)   (598)
Borrowings on notes payable to related party   11,250 387,750
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 (2,095) (887) (15,122)
Net cash provided by financing activities 128,465 91,345 2,114,244
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 31,963 (916) 93,803
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 61,840 2,681  
CASH AND CASH EQUIVALENTS, END OF PERIOD 93,803 1,765 93,803
SUPPLEMENTAL CASH FLOWS DISCLOSURES:      
Cash paid for income taxes     26
Interest paid in cash, net of amounts capitalized 7,862 7,626 67,014
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 5,523 2,907 5,523
Capitalization of interest on note payable to related party   11,876 14,219
Cancellation of principal on note payable to related party   77,187 212,334
Forward purchase contract contribution to APIC   1,080 29,317
Reclassification of forward purchase contract to APIC   $ 13,091 $ 28,080