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Stock Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 11, 2012
2012 Non Employee Directors Compensation Plan
Dec. 31, 2012
2012 Long Term Incentive Plan
Jan. 11, 2012
2012 Long Term Incentive Plan
Jan. 11, 2012
2012 Long Term Incentive Plan
Maximum
Jan. 11, 2012
2006 Stock Option Plan
Dec. 31, 2012
Stock Options Fiscal 2006 Plan
May 25, 2012
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Dec. 31, 2012
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Dec. 18, 2012
Empathy Lab LLC
Restricted Stock Units (RSUs)
Dec. 31, 2012
Empathy Lab LLC
Restricted Stock Units (RSUs)
Jan. 16, 2012
Executive Officer
Restricted Stock Units (RSUs)
Dec. 31, 2012
Executive Officer
Restricted Stock Units (RSUs)
Jan. 18, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
Dec. 31, 2012
Non Employee Directors
Restricted Stock Units (RSUs)
Apr. 05, 2012
2012 Non Employee Directors Compensation Plan
Restricted Stock Units (RSUs)
Dec. 31, 2012
2012 Non Employee Directors Compensation Plan
Restricted Stock Units (RSUs)
May 25, 2014
Scenario, Forecast
Thoughtcorp Inc
Restricted Stock Units (RSUs)
May 25, 2013
Scenario, Forecast
Thoughtcorp Inc
Restricted Stock Units (RSUs)
Dec. 18, 2015
Scenario, Forecast
Empathy Lab LLC
Restricted Stock Units (RSUs)
Dec. 18, 2014
Scenario, Forecast
Empathy Lab LLC
Restricted Stock Units (RSUs)
Dec. 18, 2013
Scenario, Forecast
Empathy Lab LLC
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)
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
2012 Non Employee Directors Compensation Plan
Restricted Stock Units (RSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]                                                                
Non vested common stock shares issued                   217,272   326,344   194,800   11,764   7,092                            
Vesting period 4 years                           12 months                                  
Percentage of restricted shares vested                           25.00%           50.00% 50.00% 33.33% 33.33% 33.33% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 100.00%
Fair value of non vested restricted shares                           $ 2,338   $ 141   $ 150                            
Stock based compensation 6,826 2,866 2,939               1,096   79   1,169   34   111                          
Fair value of restricted stock                   3,607   6,755                                        
Shares authorized to be reserved for issuance       600,000   9,246,800                                                    
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             4,916,394                                                  
Common stock shares available for issuance               733,808 859,808                                              
Option issued to purchase common stock 1,443,810 600,000 2,774,952   1,443,810                                                      
Options issued to purchase common stock, grant fair value         10,870                                                      
Number of remaining shares         8,726,293                                                      
Options issued expiration period                 10 years                                              
Expected volatility 46.00% 43.00% 43.00%                                                          
Expected term 6 years 3 months 6 years 3 months 6 years 3 months                                                          
Risk-free interest rate 1.13% 2.05% 1.78%                                                          
Expected dividend yield 0.00% 0.00% 0.00%                                                          
Total unrecognized compensation cost related to non-vested share-based compensation awards granted $ 23,449                                                              
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition 2 years