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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jan. 11, 2012
Long Term Incentive Plan Twenty Twelve
Sep. 30, 2012
Long Term Incentive Plan Twenty Twelve
Jan. 11, 2012
Long Term Incentive Plan Twenty Zero Six
Jan. 11, 2012
2012 Directors Plan
Sep. 30, 2012
Stock Options Fiscal 2006 Plan
Sep. 30, 2012
Restricted Stock Units (RSUs)
Sep. 30, 2012
Stock Options
May 25, 2012
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Sep. 30, 2012
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Sep. 30, 2012
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Jan. 16, 2012
Executive Officer
Restricted Stock Units (RSUs)
Jan. 18, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
Sep. 30, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
Sep. 30, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
Apr. 05, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
2012 Directors Plan
Sep. 30, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
2012 Directors Plan
Sep. 30, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
2012 Directors Plan
May 25, 2014
Scenario, Forecast
Thoughtcorp Inc
Restricted Stock Units (RSUs)
May 25, 2013
Scenario, Forecast
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Jan. 31, 2015
Scenario, Forecast
Executive Officer
Restricted Stock Units (RSUs)
Jan. 31, 2014
Scenario, Forecast
Executive Officer
Restricted Stock Units (RSUs)
Jan. 31, 2013
Scenario, Forecast
Executive Officer
Restricted Stock Units (RSUs)
Sep. 30, 2012
Scenario, Forecast
Executive Officer
Restricted Stock Units (RSUs)
Sep. 30, 2012
Scenario, Forecast
Executive Officer
Restricted Stock Units (RSUs)
Jan. 18, 2016
Scenario, Forecast
Non Employee Directors
Restricted Stock Units (RSUs)
Jan. 18, 2015
Scenario, Forecast
Non Employee Directors
Restricted Stock Units (RSUs)
Jan. 18, 2014
Scenario, Forecast
Non Employee Directors
Restricted Stock Units (RSUs)
Jan. 18, 2013
Scenario, Forecast
Non Employee Directors
Restricted Stock Units (RSUs)
Apr. 05, 2013
Scenario, Forecast
Non Employee Directors
Restricted Stock Units (RSUs)
2012 Directors Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items]                                                                  
Non vested common stock shares issued                   430,928         194,800       7,092                            
Vesting period                                                       12 months          
Percentage of Restricted shares vested                             25.00% 25.00%           50.00% 50.00% 25.00% 25.00% 25.00%     25.00% 25.00% 25.00% 25.00% 100.00%
Fair value of non vested restricted shares                       $ 3,607     $ 2,338 $ 141     $ 150                            
Stock based compensation 2,046 785 5,369 2,154                 451 645     9 25   37 73           146 1,023          
Non vested common stock shares issued                       217,272       11,764                                  
Shares authorized to be reserved for issuance         9,246,800     600,000                                                  
2012 Directors Plan expiration period               10 years                                                  
Common stock shares subject to outstanding awards that expire or terminate that are available for awards to be granted         6,595,136                                                        
Common Stock Shares available for issuance             733,808   857,808                                                
Option issued to purchase common stock     1,443,810     1,443,810                                                      
Options issued to purchase common stock ,grant fair value           10,870                                                      
Number of remaining shares           8,705,393                                                      
Options issued expiration period                 10 years                                                
Total unrecognized compensation cost related to non-vested share-based compensation awards granted                     $ 19,166                                            
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition                     2 years