Company Overview and Basis of Presentation - Initial Public Offering and Concurrent Private Placement - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 28, 2018	Sep. 25, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Proceeds from issuance of common stock, net of underwriters' discounts and commissions			$ 225,336
Offering costs			7,173	$ 0	$ 0
Allocated share-based compensation expense		$ 89,900	$ 131,770	$ 34,986	$ 32,957
Restricted Stock Units
Class Of Stock [Line Items]
Number of shares released for awards where service and performance vesting conditions are met			5,883,890	1,443,302	2,546,058
Restricted Stock Units | Initial Public Offering
Class Of Stock [Line Items]
Number of shares released for awards where service and performance vesting conditions are met		2,574,499
Recognized payroll tax withholding obligation		$ 21,400
Allocated share-based compensation expense		$ 89,900
Common Stock
Class Of Stock [Line Items]
Number of share, issued and sold			20,583,000
Proceeds from issuance of common stock, net of underwriters' discounts and commissions			$ 0
Initial Public Offering | Common Stock
Class Of Stock [Line Items]
Number of share, issued and sold	17,250,000
Shares issued, price per share	$ 12.00
Proceeds from issuance of common stock, net of underwriters' discounts and commissions	$ 192,500
Underwriting discounts and commissions	$ 14,500
Underwriters Option Included in IPO | Common Stock
Class Of Stock [Line Items]
Number of share, issued and sold	2,250,000
Private Placement | Common Stock
Class Of Stock [Line Items]
Number of share, issued and sold	3,333,333
Shares issued, price per share	$ 12.00
Proceeds from issuance of common stock, net of underwriters' discounts and commissions	$ 40,000
IPO and Private Placement | Common Stock
Class Of Stock [Line Items]
Proceeds from issuance of common stock, net of underwriters' discounts and commissions	225,300
Offering costs	$ 7,200