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Equity Plans and Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Employee
CompensationPlan
Dec. 31, 2012
Employee
Dec. 31, 2011
Dec. 31, 2013
Employee Stock Purchase Plan
Jan. 31, 2004
Employee Stock Purchase Plan
The commencement of the offer period (generally, the fifteenth day in February or August)
Jan. 31, 2004
Employee Stock Purchase Plan
The exercise date, which is the last day of a purchase period (generally, the fourteenth day in February or August)
Dec. 31, 2013
Non Employee Awards
Dec. 31, 2013
Additional
Dec. 31, 2012
Additional
Dec. 31, 2013
Restricted Stock Units (RSUs)
Dec. 31, 2012
Restricted Stock Units (RSUs)
Dec. 31, 2011
Restricted Stock Units (RSUs)
Jan. 31, 2004
2004 Plan
Dec. 31, 2013
2004 Plan
Dec. 31, 2013
Inducement Plan
Jan. 31, 2011
2011 Plan
Dec. 31, 2013
2011 Plan
Dec. 31, 2013
Time Based Vesting Schedule
Jan. 31, 2004
Maximum
2004 Plan
Jan. 31, 2004
Maximum
2004 Plan
Other Participants
Jan. 31, 2010
Maximum
Inducement Plan
May 29, 2013
Maximum
2011 Plan
Jan. 31, 2011
Maximum
2011 Plan
Jan. 31, 2004
Minimum
2004 Plan
Stock possessing more than 10% of the voting power of all classes of the Company's stock or the stock of any parent or subsidiary of the Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                                
Number of share-based compensation plans 3                                              
Issuance of common stock shares                                     3,500,000   1,500,000   25,000,000  
Expiration period 10 years                             10 years       10 years       5 years
Purchase price per share as percentage of fair market value of common stock         85.00% 85.00%             100.00%                     110.00%
Number of shares of Common Stock outstanding 15,765,000 13,806,000                       4,066,277 743,625   10,954,940              
Increase in the aggregate number of shares of common stock authorized for issuance                                           10,000,000    
Shares reserved and approved for issuance       996,000                         13,666,964              
Total intrinsic value of options exercised $ 300,000 $ 2,700,000 $ 100,000                                          
Total fair value of stock options vested 12,100,000 9,600,000 2,800,000                                          
Stock based compensation expense related to restricted stock                   100,000                            
Aggregate intrinsic value                   2,500,000                            
Grant date fair value of restricted stock                   $ 1.23 $ 4.23 $ 0                        
Total fair value of restricted stock units                   100,000 200,000 800,000                        
Options vesting period 4 years                                              
Options and restricted stock units outstanding 2,047,466                                              
Expected dividend yield 0.00%                                              
Recognized stock-based compensation expense 4,900,000 1,500,000           1,300,000 700,000                              
Stock compensation expense 12,340,000 10,439,000 5,189,000       500,000                                  
Number of employees under stock option 5 1                                            
Total unrecognized compensation cost related to non-vested equity awards $ 3,800,000     $ 100,000                           $ 10,300,000            
Total unrecognized compensation cost, weighted-average vesting period       1 year 4 months 24 days                           2 years 9 months 18 days            
Shares issued to employees       828,414                                        
Shares remaining available for future purchases       167,586