Stock-Based Compensation - Assumptions (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 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	6 years 1 month 6 days	6 years 1 month 10 days	6 years 1 month 6 days
Risk-free interest rate, min (as percent)	1.15%	1.70%	1.15%	1.35%
Risk-free interest rate, max (as percent)	1.32%	1.93%	1.90%	1.93%
Expected volatility, min (as percent)	44.36%	46.09%	44.36%	42.35%
Expected volatility, max (as percent)	44.57%	47.07%	45.29%	47.07%