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Stock-Based Compensation (Employee Stock Purchase Plan Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 8,391 $ 5,498  
Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 months    
Expected volatility 48.00%    
Dividend yield 0.00%    
Risk-free interest rate 0.33%    
2014 Employee Stock Purchase Plan | Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum employee subscription rate 10.00%    
Purchase price of common stock, percent 85.00%    
Number of Shares Reserved 1,193,565    
Increase in shares authorized, percent of outstanding stock 1.00%    
Issuance of common stock related to employee stock purchase plan (in shares)     169,362
Unrecognized employee stock-based compensation $ 400