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Description of Business (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 16, 2017 USD ($) class vote $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Aug. 03, 2019 USD ($)	Jul. 28, 2018 USD ($)	Jul. 29, 2017 USD ($)	Nov. 17, 2017 shares
Subsidiary, Sale of Stock [Line Items]
Number of new classes of common stock authorized | class	2
Common stock, conversion ratio	1
Offering costs | $			$ 0	$ 0	$ 1,879
Preferred stock, shares outstanding (in shares)						0
Warrants outstanding (in shares)						0
Class A common stock
Subsidiary, Sale of Stock [Line Items]
Number of votes per share | vote	1
Class A common stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	8,000,000
Price per share (in dollars per share) | $ / shares	$ 15.00
Net proceeds after underwriting discounts and offering costs | $	$ 110,400
Underwriting discounts | $	6,200
Offering costs | $	$ 3,400
Class A common stock | Over-allotment option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)		1,175,557
Price per share (in dollars per share) | $ / shares		$ 15.00
Net proceeds after underwriting discounts and offering costs | $		$ 16,700
Class B common stock
Subsidiary, Sale of Stock [Line Items]
Number of votes per share | vote	10
Class B common stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares converted as a result of the IPO (in shares)	59,511,055
Number of shares automatically exercised as a result of the IPO (in shares)	1,066,225

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