Stock-Based Compensation - Assumptions (Details)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)		6 years 1 month 6 days
Risk-free interest rate, min (as percent)	1.48%	1.35%
Risk-free interest rate, max (as percent)	1.90%	1.74%
Expected volatility, min (as percent)	44.96%	42.35%
Expected volatility, max (as percent)	45.29%	44.08%
Forfeiture rate, min (as percent)	0.00%	5.12%
Forfeiture rate, max (as percent)	4.80%	5.21%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)	6 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)	6 years 1 month 6 days