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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Warrants
Sep. 30, 2012
Warrants
Sep. 30, 2013
Senior Management Group
Sep. 30, 2013
All Other Employees
Sep. 30, 2013
Restricted Stock Units (RSUs)
Sep. 30, 2013
Performance based Vesting Condition
May 29, 2013
2011 Plan
Sep. 30, 2013
Non Employee Awards
Sep. 30, 2013
Time Based Vesting Schedule
Sep. 30, 2013
Employee Stock Purchase Plan
Sep. 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                 $ 2,100,000            
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria                   2,600,000          
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 1,000,000   5,100,000                        
Stock-based compensation expense 2,845,000 1,903,000 10,847,000 6,294,000               400,000      
Total unrecognized compensation cost related to non-vested equity awards $ 5,000,000   $ 5,000,000                   $ 12,100,000    
Total unrecognized compensation cost, weighted-average vesting period                         2 years 11 months 5 days    
Shares reserved and approved for issuance                           996,000  
Shares issued to employees                           828,414 129,690
Shares remaining available for future purchases                           167,586  
Warrants to purchase common stock         12,500,000                    
Warrants exercised         84,000 4,700,000                  
Warrants exercisable per share         $ 1.96