Stock-Based Compensation - Assumptions (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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 6 days
Risk-free interest rate, min (as percent)	1.41%	1.50%	1.41%	1.35%
Risk-free interest rate, max (as percent)	1.54%	1.75%	1.90%	1.75%
Expected volatility, min (as percent)	44.67%	42.74%	44.67%	42.35%
Expected volatility, max (as percent)	45.06%	43.55%	45.29%	44.08%
Forfeiture rate, min (as percent)	4.64%	5.03%	0.00%	5.03%
Forfeiture rate, max (as percent)	5.15%	6.41%	5.15%	6.41%
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 10 days