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Financing Agreements - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
May 09, 2012
Nov. 03, 2011
Nov. 02, 2010
Apr. 30, 2010
Apr. 16, 2010
Nov. 30, 2009
Apr. 18, 2006
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Dec. 31, 2012
SDI
Aug. 17, 2009
Maximum
Dec. 31, 2012
2007 Loan Agreement
Dec. 31, 2012
2007 Loan Agreement
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
Other Liabilities [Line Items]                                      
Stock issued during period, shares 17,500,000 27,600,000 26,450,000 1,076,420       900,860 1,281,100               10,995,210 2,350,000  
Public offering net price per share $ 4.25 $ 2.50 $ 1.70   $ 1.4525                            
Net proceeds from offering $ 69.6 $ 64.5 $ 42.0   $ 41.1     $ 1.2 $ 2.3                    
Sale of stock pursuant to exercise of underwriters overallotment option   3,600,000 3,450,000                                
Commitment to purchase shares value                                     30.0
Purchase agreement term                               25 months      
Percentage of commitment to purchase shares value as commitment fee                               4.00%      
Commitment fee paid                             1.2        
Issuance of shares of common stock for commitment fee                             600,000        
Proceeds from Issuance of Common Stock                                 26.7 3.3  
Underwriting discount and offering expenses         3.0                            
Units issued during offering         30,293,000                            
Warrants exercisable period       5 years 5 years 5 years 5 years                        
Warrants exercise price       $ 1.50 $ 1.50 $ 1.94 $ 7.32                        
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 to purchase shares of common stock outstanding                   10,913,873 6,765,128   1,800,000            
Common stock aggregate offering price                       $ 15              
Issuance of warrants for common shares to be purchased                         3,550,000 3,550,000          
Warrants to purchase common stock                   12,700,000