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Stockholders' Equity - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Senior Management Group
Jun. 30, 2013
All Other Employees
Jun. 30, 2013
Non Employee Awards
Jun. 30, 2013
Time Based Vesting Schedule
Jun. 30, 2013
Warrants
Jun. 30, 2012
Warrants
Jun. 30, 2013
Restricted Stock Units (RSUs)
Jun. 30, 2013
Performance based Vesting Condition
May 29, 2013
2011 Plan
Jun. 30, 2013
Employee Stock Purchase Plan
Jun. 30, 2013
Employee Stock Purchase Plan
Current Period One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Increase in the aggregate number of shares of common stock authorized for issuance                         10,000,000    
Aggregate intrinsic value                     $ 1,800,000        
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria                       2,500,000      
Expiration period     10 years                        
Options vesting period     4 years                        
Expected Dividend yield     0.00%                        
Expected Life (in year)         6 years 5 years 6 months                  
Recognized stock-based compensation expense 1,900,000   3,900,000                        
Stock-based compensation expense 3,736,000 2,069,000 8,002,000 4,391,000     100,000                
Total unrecognized compensation cost related to non-vested equity awards $ 6,800,000   $ 6,800,000         $ 15,800,000              
Total unrecognized compensation cost, weighted-average vesting period               2 years 7 months 28 days              
Shares reserved and approved for issuance                           996,000  
Shares issued to employees                           761,222 62,498
Shares remaining available for future purchases                           234,778  
Warrants to purchase common stock                 12,500,000            
Warrants exercised                 84,000 4,700,000          
Warrants exercisable per share                 $ 1.96