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Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 19, 2014
USD ($)
shares
Apr. 02, 2014
shares
Mar. 26, 2013
USD ($)
Jan. 24, 2013
USD ($)
shares
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
shares
$ / shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Apr. 01, 2014
USD ($)
$ / shares
May. 31, 2013
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                        
Interest costs incurred related to the Company's total debt         $ 2,800,000 $ 2,800,000 $ 8,400,000 $ 7,200,000        
Net proceeds from Note offering             0 143,894,000        
Amount of discount         9,357,000   9,357,000   $ 11,124,000      
Debt conversion expense             0 1,766,000        
Solazyme Bunge JV                        
Debt Instrument [Line Items]                        
Interest costs capitalized         $ 0 $ 0 0 $ 600,000        
Senior Subordinated Notes                        
Debt Instrument [Line Items]                        
Debt issuance costs             1,000,000          
Net proceeds from Note offering             262,600,000          
Underwriting Discounts And Commissions             $ 10,900,000          
Upon a fundamental change, Company to pay a percentage of the principal amount             100.00%          
Senior Subordinated Notes | 2018 Notes                        
Debt Instrument [Line Items]                        
Effective percentage rate       6.00%                
Aggregate principal amount of debt       $ 125,000,000.0                
Conversion rate of convertible note into shares of common stock | shares       121.1240     121.1240          
Principal amount of convertible notes, denominator       $ 1,000                
Debt conversion, original principal amount $ 17,500,000                      
Debt conversion, shares issued in conversion | shares 2,409,964                      
Debt conversion expense                 $ 1,800,000      
Conversion price (in dollars per share) | $ / shares       $ 8.26 $ 8.26   $ 8.26          
Conversion of stock conversion price (in dollars per share) | $ / shares       $ 83.33                
Convertible debt             $ 63,400,000          
Number of common shares issued upon early conversion of notes | shares         0              
Senior Notes, Noncurrent         $ 61,600,000   $ 61,600,000          
Senior Subordinated Notes | 2019 Notes                        
Debt Instrument [Line Items]                        
Effective percentage rate                   5.00%    
Aggregate principal amount of debt                   $ 149,500,000.0    
Conversion rate of convertible note into shares of common stock | shares   75.7576         75.7576          
Principal amount of convertible notes, denominator                   $ 1,000    
Conversion price (in dollars per share) | $ / shares         $ 13.20   $ 13.20     $ 13.20    
Conversion of stock conversion price (in dollars per share) | $ / shares                   $ 83.33    
Senior Notes, Noncurrent         $ 149,500,000   $ 149,500,000          
HSBC Facility                        
Debt Instrument [Line Items]                        
Credit facility maximum borrowing                     $ 35,000,000.0 $ 30,000,000.0
Outstanding balance under the credit facility     $ 10,400,000                  
Debt issuance costs     200,000                  
Remaining Outstanding under HSBC facility         $ 26,400,000   $ 26,400,000          
Cash and unrestricted cash equivalents     $ 35,000,000.0                  
Additional percent of aggregate letter of credit under revolving facility     110.00%                  
Commitment fee     2.50%                  
Outstanding balance under the credit facility     2.00%                  
Letter of Credit Denominated in US Dollars | HSBC Facility                        
Debt Instrument [Line Items]                        
Outstanding balance under the credit facility         105.00%   105.00%          
Letter of Credit Denominated in Foreign Currency | HSBC Facility                        
Debt Instrument [Line Items]                        
Outstanding balance under the credit facility         110.00%   110.00%