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Stock Option Plans and Share-Based Compensation - ESPP- Employee stock purchase plan (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Employee Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ESPP max percent of earnings contributable   15.00%
ESPP max annual contribution   $ 25,000
ESPP purchase price as percent of begin and-or ending fair value   85.00%
Capital shares reserved for future issuance 846,891 846,891
Shares issued in period 0 254,009
Employee Stock Purchase Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of additional shares authorized   2,622,426.000
Compensation not yet recognized $ 900,000 $ 900,000
Compensation cost not yet recognized, period for recognition   1 year 0 months