Stock-Based Compensation - Assumptions (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Performance-based awards
Valuation of Stock Option Grants to Employees
Expected term (years)		7 years 3 months
Expected volatility		50.00%
Expected volatility, minimum	55.00%
Expected volatility, maximum	65.00%
Risk free interest rate, minimum	0.54%	1.63%
Risk free interest rate, maximum	1.64%	2.61%
Performance-based awards | Minimum
Valuation of Stock Option Grants to Employees
Expected term (years)	5 years 3 months
Performance-based awards | Maximum
Valuation of Stock Option Grants to Employees
Expected term (years)	7 years 3 months
Employee and non-employee stock options
Stock Based Compensation
Options granted (in shares)	457,000
Employee stock options
Valuation of Stock Option Grants to Employees
Expected volatility, minimum	49.94%	42.53%	40.28%
Expected volatility, maximum	61.96%	45.84%	42.53%
Expected dividend yield	0.00%	0.00%	0.00%
Risk free interest rate, minimum	0.31%	1.60%	2.37%
Risk free interest rate, maximum	1.70%	2.60%	3.06%
Employee stock options | Minimum
Valuation of Stock Option Grants to Employees
Expected term (years)	5 years 2 months 19 days	5 years 2 months 23 days	5 years 2 months 26 days
Employee stock options | Maximum
Valuation of Stock Option Grants to Employees
Expected term (years)	10 years	10 years	5 years 7 months 13 days
Non-employee stock options
Stock Based Compensation
Options granted (in shares)	45,577
Options unvested (in shares)	5,366