Stock-Based Compensation - Assumptions (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	1.35%	1.52%	1.00%
Risk-free interest rate, max	1.93%	2.80%	2.89%
Expected volatility, min	42.35%	45.84%	51.09%
Expected volatility, max	47.07%	52.50%	53.84%
Forfeiture rate, min	4.82%	0.00%	0.00%
Forfeiture rate, max	5.21%	6.76%	6.02%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)		5 years	6 years 1 month 6 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)		10 years	10 years