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Notes Payable - Additional Information 2 (Detail) (USD $)
3 Months Ended 176 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2014
Essex Notes [Member]
Mar. 31, 2013
Essex Notes [Member]
Jan. 31, 2014
Essex Notes [Member]
Dec. 31, 2013
Essex Notes [Member]
Dec. 20, 2013
Essex Notes [Member]
Dec. 20, 2013
Essex Notes [Member]
Maximum [Member]
Mar. 31, 2014
Essex Notes [Member]
Warrants [Member]
Dec. 31, 2013
Essex Notes [Member]
Short Term [Member]
Jan. 31, 2014
Essex Notes [Member]
Series E-5 convertible preferred stock [Member]
Mar. 31, 2014
Hercules Notes Payable [Member]
Mar. 31, 2013
Hercules Notes Payable [Member]
Dec. 31, 2013
Hercules Notes Payable [Member]
Debt Instrument [Line Items]                              
Secured promissory notes                 $ 10,800,000            
Lease period               3 years              
Percentage of original purchase amount of asset at end of lease               10.00%              
Short term notes           2,500,000 2,500,000                
Common stock shares purchased                     12,345 12,345      
Fair value of warrants       200,000                      
Debt issuance cost       30,000                 544,000    
Interest expense for amortization of warrant 9,841,000 12,624,000 79,100,000             9,000          
Unamortized debt discount 216,000   216,000 200,000                 35,000   43,000
Payment of principal and interest, Notes payable $ 2,042,000 $ 1,816,000 $ 32,038,000 $ 6,000 $ 0               $ 2,300,000 $ 2,300,000