Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation Plans and Awards (Schedule of Stock-based Compensation Expense) (Details)

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Stock-based Compensation Plans and Awards (Schedule of Stock-based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense $ 443 $ 326 $ 791 $ 693
Sales and Marketing [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense 161 150 292 251
Research and Development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense 108 21 162 90
General and Administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense $ 174 $ 155 $ 337 $ 352