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Preferred Stock, Common Stock and Warrants - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Oct. 31, 2013
May 09, 2012
Nov. 03, 2011
Nov. 02, 2010
Apr. 30, 2010
Apr. 16, 2010
Nov. 30, 2009
Nov. 04, 2008
Apr. 18, 2006
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 29, 2013
Dec. 31, 2013
SDI
Dec. 31, 2013
2007 Loan Agreement
Oct. 31, 2013
Common Stock
Dec. 31, 2013
Common Stock
Nov. 04, 2008
Minimum
Oct. 31, 2013
Series B Convertible Preferred Stock
Dec. 31, 2013
Series B Convertible Preferred Stock
Dec. 31, 2012
Series B Convertible Preferred Stock
Mar. 29, 2013
MLV
Maximum
Sep. 30, 2010
Aspire Capital Fund Llc
Sep. 20, 2010
Aspire Capital Fund Llc
Dec. 31, 2011
Aspire Capital Fund Llc
Dec. 31, 2010
Aspire Capital Fund Llc
Sep. 20, 2010
Aspire Capital Fund Llc
Maximum
Preferred Stock Common Stock And Warrants [Line Items]                                                      
Common stock, shares authorized                   350,000,000 250,000,000   350,000,000                            
Preferred stock, shares authorized                   5,000,000 5,000,000                 43,000 0            
Preferred stock, shares outstanding                   0 0                 0 0            
Stock issued during period, shares 79,570,000 17,500,000 27,600,000 26,450,000 1,076,420 30,293,000                     79,570,000   43,430           10,995,210 2,350,000  
Preferred stock, par value               $ 0.001   $ 0.001 $ 0.001               $ 0.001                
Public offering net price per share $ 1.075 $ 4.25 $ 2.50 $ 1.70   $ 1.4525                         $ 1,075                
Gross proceeds from issuance of stock                               $ 85,500,000     $ 46,700,000                
Issuance costs           3,000,000                   4,500,000     2,500,000                
Net proceeds from offering   69,600,000 64,500,000 42,000,000   41,100,000                   80,900,000     44,200,000                
Convertible common stock shares                                       1,000              
Convertible preferred stock, terms of conversion                                       The holder is prohibited from converting the Series B Convertible Preferred Stock into shares of common stock if, as a result of such conversion, the holder and its affiliates would own more than 9.98% of the total number of shares of common stock then issued and outstanding.              
Convertible preferred stock, settlement terms                                       In the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Convertible Preferred Stock will receive a payment equal to $0.001 per share before any proceeds are distributed to the common stockholders.              
Convertible common stock exceeded allocated purchase price of preferred stock                                       8,500,000              
Common stock, par value               $ 0.001   $ 0.001 $ 0.001                                
Dividends payable date               Nov. 17, 2008                                      
Preferred shares price               $ 6.00                                      
Percentage of common shares outstanding                                   20.00%                  
Percentage of assets                                   50.00%                  
Rights expiration date               Nov. 17, 2008                                      
Common stock aggregate offering price                   80,999,000             80,000         50,000,000          
Commission on gross sales proceeds of common stock                                           3.00%          
Sale of stock pursuant to exercise of underwriters overallotment option     3,600,000 3,450,000                                              
Commitment to purchase shares value                                                     30,000,000
Purchase agreement term                                               25 months      
Percentage of commitment to purchase shares value as commitment fee                                               4.00%      
Commitment fee paid                                             1,200,000        
Issuance of shares of common stock for commitment fee                                             600,000        
Proceeds from issuances of common stock                   $ 80,856,000 $ 71,780,000 $ 91,298,000                         $ 26,700,000 $ 3,300,000  
Number of shares of common stock in each unit           1                                          
Number of warrants in each unit           1                                          
Number of share per warrant           0.5                                          
Warrants exercise price         1.50 1.50 1.94   7.32 1.96                                  
Warrants exercisable period         5 years 5 years 5 years   5 years                                    
Warrants outstanding                   10,913,873       6,765,128 1,550,000                        
Issuance of warrants for common shares to be purchased                             3,550,000                        
Warrants to purchase common stock                   12,500,000                                  
Number Of Warrants Exercised During Period                   250,000 13,000,000