Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
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)	29,421,131	28,696,321
Common stock, shares outstanding (in shares)	29,421,131	28,696,321
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)	736,706	681,585
Treasury shares acquired (in shares)	203,394	169,893
Class B Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)	35,260,680	35,452,178
Common stock, shares outstanding (in shares)	35,260,680	35,452,178
Class B common stock converted to class A common stock (in shares)	191,498	599,991