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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Series B Convertible Preferred Stock
Dec. 31, 2013
Series B Convertible Preferred Stock
Jun. 30, 2014
Time Based Vesting Schedule
Jun. 30, 2014
Performance Based Vesting Schedule
Jun. 30, 2014
Restricted Stock Units (RSUs)
Jun. 30, 2014
Performance based Vesting Condition
May 31, 2014
2004 Employee Stock Purchase Plan
Jun. 30, 2014
2004 Employee Stock Purchase Plan
Jun. 30, 2014
2004 Employee Stock Purchase Plan
Current Period One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Aggregate intrinsic value                   $ 2,900,000        
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria                     1,100,000      
Options vesting period     4 years                      
Expiration period     10 years                      
Stock-based compensation expense 1,676,000 3,736,000 2,946,000 8,002,000                    
Recognized stock-based compensation expense   1,900,000   3,900,000                    
Total unrecognized compensation cost related to non-vested equity awards               $ 16,600,000 $ 400,000          
Total unrecognized compensation cost, weighted-average vesting period               3 years 11 days            
Shares reserved and approved for issuance                         996,000  
Shares issued to employees                       500,000 887,987 59,573
Shares remaining available for future purchases                         108,013  
Warrants to purchase common stock 10,900,000   10,900,000                      
Warrants exercisable per share 1.50   1.50                      
Warrants exercised 100 84,000 100 84,000                    
Preferred stock, shares authorized 5,000,000   5,000,000   5,000,000 43,000 43,000              
Stock issued during period, shares           43,430                
Preferred stock, par value $ 0.001   $ 0.001   $ 0.001 $ 0.001 $ 0.001              
Convertible common stock shares 1,000   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.