Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Member Units | Bold Contribution Agreement
Capital Unit [Line Items]
Conversion ratio (in shares)	1
Class A Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)	30,343,421	29,421,131
Common stock, shares outstanding (in shares)	30,343,421	29,421,131
Class A Common Stock | Bold Contribution Agreement
Capital Unit [Line Items]
Conversion ratio (in shares)	1
Class A Common Stock | 2014 Plan
Capital Unit [Line Items]
Common stock shares issued upon completion of public offering (in shares)	914,905	736,706
Treasury shares acquired (in shares)	243,924	203,394
Class B Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)	35,009,371	35,260,680
Common stock, shares outstanding (in shares)	35,009,371	35,260,680
Class B common stock converted to class A common stock (in shares)	251,309	191,498