Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Black-Scholes-Merton Option Pricing Model (Details)

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Stock-Based Compensation - Black-Scholes-Merton Option Pricing Model (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted-average risk-free interest rate 2.69%  
Weighted-average expected life (in years) 9 years 10 months 24 days  
Expected dividend yield 0.00%  
Weighted-average expected volatility 45.00%  
Employee Stock Option    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted-average risk-free interest rate 1.63% 1.84%
Weighted-average expected life (in years) 6 years 3 months 18 days 6 years 3 months 18 days
Expected dividend yield 0.00% 0.00%
Weighted-average expected volatility 47.00% 48.00%