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Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Feb. 27, 2015
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Dec. 31, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Segment
shares
Jun. 30, 2014
USD ($)
Mar. 05, 2015
USD ($)
May. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Significant Accounting Policies [Line Items]                      
Deferred revenue $ 856,000     $ 856,000   $ 856,000       $ 1,700,000  
Sales discount percentage 2.00%     2.00%   2.00%          
Sales discount term           30 days          
Trade receivables, credit period           30 days          
Accounts receivable written off $ 0     $ 0   $ 0          
Warrants expiration date           Feb. 27, 2015          
Warrants exercised | shares           1,844,585          
Warrants expired | shares   6,242,803                  
Warrant derivative liability     $ 100,000                
Derivative liability fair value assumptions, risk-free rate     0.04%                
Derivative liability fair value assumptions, term     1 month 28 days                
Derivative liability fair value assumptions, dividend yield     0.00%                
Derivative liability fair value assumptions, volatility rate     79.00%                
Gain (loss) on change in fair value of derivative liability       (600,000) $ 3,011,000 $ (136,000) $ 7,404,000        
Number of operating segments | Segment           1          
Embedded Derivative Financial Instruments                      
Significant Accounting Policies [Line Items]                      
Gain (loss) on change in fair value of derivative liability (800,000)         $ 700,000 $ 5,200,000        
Change of control obligation                     $ 140,000,000
Maximum repayment of future revenue and receivables                     $ 150,000,000
Long term debt redemption feature $ 5,600,000   $ 4,800,000 5,600,000   5,600,000          
Preferred Stock Purchase Option                      
Significant Accounting Policies [Line Items]                      
Gain (loss) on change in fair value of derivative liability           $ (946,000)          
Derivative liability at fair value               $ 900,000      
Top Three Customers | Gross Product Sales | Customer Concentration Risk                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage           95.00% 95.00%        
Top Three Customers | Accounts Receivable | Customer Concentration Risk                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage           96.00% 96.00%        
Prior To Agreement                      
Significant Accounting Policies [Line Items]                      
Warrants expiration date           Oct. 16, 2014          
Convertible Debt                      
Significant Accounting Policies [Line Items]                      
Gain (loss) on change in fair value of derivative liability           $ 1,500,000          
Derivative liability at fair value                 $ 3,500,000    
Convertible Debt | 2014 Notes                      
Significant Accounting Policies [Line Items]                      
Convertible senior notes, discount                 $ 27,900,000    
Derivative liability fair value assumptions, risk-free rate 3.00%   2.70%                
Derivative liability fair value assumptions, dividend yield 19.00%   24.80%                
Derivative liability fair value assumptions, volatility rate 79.00%   82.00%                
Gain (loss) on change in fair value of derivative liability $ 1,500,000                    
Long term debt redemption feature 1,100,000   $ 2,600,000 1,100,000   1,100,000          
Convertible Debt | 2012 Notes                      
Significant Accounting Policies [Line Items]                      
Convertible senior notes, discount 0   0 0   0          
Convertible Debt | Non Cash | 2014 Notes                      
Significant Accounting Policies [Line Items]                      
Convertible senior notes, discount $ 25,400,000   $ 28,200,000 $ 25,400,000   $ 25,400,000          
Warrants Issued October 2009                      
Significant Accounting Policies [Line Items]                      
Warrants expiration date           Feb. 27, 2015          
Warrants outstanding | shares 0     0   0          
Warrants exercised | shares           1,844,585          
Warrants expired | shares   6,242,803                  
Gain (loss) on change in fair value of derivative liability           $ 100,000          
Warrants Issued October 2009 | Prior To Agreement                      
Significant Accounting Policies [Line Items]                      
Warrants expiration date           Oct. 16, 2014          
Maximum                      
Significant Accounting Policies [Line Items]                      
Short term highly liquid instruments, maturity date           90 days          
Warrants outstanding | shares     8,087,388                
Maximum | Embedded Derivative Financial Instruments                      
Significant Accounting Policies [Line Items]                      
Derivative liability fair value assumptions, term 5 years 7 months 6 days   3 years 7 months 6 days                
Derivative liability fair value assumption, coupon rate 12.50%   10.80%                
Derivative liability fair value assumptions, market yields 16.40%   16.80%                
Maximum | Warrants Issued October 2009                      
Significant Accounting Policies [Line Items]                      
Warrants outstanding | shares     8,087,388                
Minimum | Embedded Derivative Financial Instruments                      
Significant Accounting Policies [Line Items]                      
Derivative liability fair value assumptions, term 2 years 7 months 6 days   2 years 3 months 18 days                
Derivative liability fair value assumption, coupon rate 8.90%   9.80%                
Derivative liability fair value assumptions, market yields 10.00%   10.00%