Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plans - Additional Information (Details)

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Stock Incentive Plans - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Apr. 02, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 12, 2012
2002 Plan
Contract Termination
Jun. 30, 2014
2012 Plan
Jun. 30, 2014
2012 Plan
Maximum
Jun. 30, 2014
2014 Equity Incentive Plan
Mar. 31, 2014
Employee Stock Purchase Plan
Jun. 30, 2014
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Stock option shares outstanding             1,424,540          
Stock options and other equity awards               1,216,772        
Stock option exercise price fair value percentage                 100.00%      
Common stock reserved for future issuance                   895,346    
Number of previously granted awards under 2012 and 2002 plan                   2,328,569    
Percentage on outstanding shares of common stock                   4.00%   1.50%
Stock option period, expiration       10 years                
Stock option period, vested       4 years                
Number of shares approved for issuance 632,694                     179,069
Number of shares exercise price $ 16.62                      
Rate of reduced stock-based compensation expense for estimated forfeiture       6.66%                
Exercise price as a percentage of stock price on the enrollment date                     85.00%  
Exercise price as a percentage of stock price on the purchase date                     85.00%  
Potential increase of shares available for issuance                       179,069
Stock-based compensation expense   $ 535 $ 27 $ 666 $ 51              
Share-based Compensation, Unrecognized expense, Nonvested Granted Awards   $ 5,438   $ 5,438   $ 1,370