Common Stock (Details)			3 Months Ended
	May 09, 2017 class_of_stock	May 09, 2017	Mar. 31, 2018 shares	Dec. 31, 2017 shares	Mar. 31, 2017 shares
Bold Contribution Agreement
Capital Unit [Line Items]
Number of classes of common stock | class_of_stock	2
Member Units
Capital Unit [Line Items]
EEH Units and Class B Common Stock converted to Class A Common Stock (in shares)			194,046
Member Units | Bold Contribution Agreement
Capital Unit [Line Items]
Stock conversion (in shares)			1
2014 Plan
Capital Unit [Line Items]
Common stock, shares issued (in shares)					285,875
Class A Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)			27,864,956	27,584,638
Common stock, shares outstanding (in shares)			27,864,956	27,584,638
EEH Units and Class B Common Stock converted to Class A Common Stock (in shares)			194,046
Class A Common Stock | Bold Contribution Agreement
Capital Unit [Line Items]
Stock recapitalization ratio		1
Stock conversion (in shares)			1
Class A Common Stock | 2014 Plan
Capital Unit [Line Items]
Common stock, shares issued (in shares)			86,272
Class B Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)			35,858,123	36,052,169
Common stock, shares outstanding (in shares)			35,858,123	36,052,169
EEH Units and Class B Common Stock converted to Class A Common Stock (in shares)			194,046
Class B Common Stock | Bold Contribution Agreement
Capital Unit [Line Items]
Stock conversion (in shares)			1