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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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